Infantile Colic

Clinical Snapshot

Infantile colic is a behavioural syndrome of paroxysmal, difficult-to-console crying in an otherwise healthy, well-fed infant, classically defined by Wessel's 1954 "Rule of Threes": crying for more than 3 hours per day, on more than 3 days per week, for more than 3 weeks, in an infant who is thriving and has no identifiable underlying illness.^[1] The single most important framing point for pharmacist counselling is that colic is a diagnosis of exclusion — it can only be applied once organic causes of crying (cow's milk protein allergy or intolerance, gastroesophageal reflux disease, infection, a hair tourniquet, a corneal abrasion, an anal fissure, an incarcerated hernia, and others) have been reasonably ruled out by history and examination, not simply assumed because a baby cries a great deal.^[2]

Colic affects an estimated 10-40% of infants worldwide, typically peaks around 6 weeks of age, and resolves on its own by 3-4 months in the large majority of cases.^[3]^[2] No treatment reliably shortens this natural course, and management centres on ruling out organic disease, providing genuine parental reassurance and education, offering a small number of evidence-supported interventions, and — just as importantly — protecting parental mental health and infant safety during an exhausting several-week period that is a recognized trigger for abusive head trauma.^[4]

Recognize the Condition

Typical pattern

Crying is paroxysmal — it starts and stops relatively abruptly, clusters in the late afternoon and evening, and is louder, higher-pitched, and more difficult to console than an infant's usual fussing. During an episode, infants often flush, draw their legs up toward the abdomen, clench their fists, and pass gas — findings long assumed to indicate abdominal pain, though there is no consistent evidence that colicky infants actually have more intestinal gas or different gut transit than other infants; these signs are better understood as the physical expression of intense crying itself rather than proof of a specific gastrointestinal cause.^[2] Between episodes, the infant feeds, sleeps, and gains weight normally — a normal growth trajectory and a genuinely well appearance between crying spells are central to the diagnosis, not incidental findings.

Epidemiology

Colic occurs with roughly equal frequency in males and females and shows no consistent association with feeding type (breast versus formula), gestational age, birth order, or socioeconomic status.^[2] It is common — most estimates place it at roughly 10-40% of infants, a wide range that mostly reflects real differences in diagnostic threshold between studies rather than true prevalence variation.^[2]

Natural course

Crying duration typically follows a predictable arc: increasing from birth, peaking around 6 weeks of age, and declining thereafter, largely resolved by 3-4 months of age and almost always resolved by 5-6 months.^[3]^[2] This predictable resolution is itself a useful counselling tool — it lets a pharmacist give a distressed parent a genuine, evidence-based endpoint rather than only generic reassurance. An infant whose excessive crying begins after 4 months of age, or that persists essentially unchanged beyond 4-5 months, has an atypical course that should prompt reassessment for an organic cause rather than being labelled as "colic running long" (see Treatment Failure/Next Step).

Risk Factors

No single cause of colic has been established, and it is increasingly understood as the extreme end of a normal, self-limited infant-crying curve rather than a discrete disease with one mechanism.^[4] Proposed contributing mechanisms, none proven causal, include:

Gastrointestinal immaturity, visceral hypersensitivity, and an altered gut microbiota — fecal microbial composition differs, on average, between colicky and non-colicky infants in some studies, though the direction of causation is unclear.^[2]
Elevated fecal calprotectin (a marker of intestinal inflammation) has been found in some colicky infants, suggesting a low-grade gut inflammatory component in at least a subset.^[2]
Feeding technique contributing to aerophagia (swallowed air), and, less consistently, altered gut motility or serotonin signalling.
Heightened sensitivity to normal gut sensations or environmental stimulation, consistent with colic being part of a normal developmental spectrum of infant crying and self-regulation rather than a distinct pathology.^[4]

Risk factors

Prenatal maternal smoking or nicotine exposure has been associated with increased colic risk in several studies.^[2]
A family or infant history of atopy raises the specific likelihood that cow's milk protein allergy or intolerance, rather than idiopathic colic, is the actual driver of the crying — this is a risk factor for the differential diagnosis, not for colic itself (see Assessment & Diagnosis).
Maternal anxiety, stress, or limited social support does not cause colic, but it strongly shapes how much distress a given amount of infant crying produces in the caregiver — making it the single most important risk factor to screen for from a patient-safety standpoint (see Red Flags & Refer and Non-Pharmacologic Treatment).^[4]
No consistent association exists with sex, birth order, gestational age at birth, or feeding type — colic is not more common in formula-fed or breastfed infants as a group.^[2]

Red Flags & Refer

Colic is a diagnosis of exclusion — any of the following means the crying is not simple colic until proven otherwise, and warrants further assessment rather than reassurance alone:

Poor weight gain or weight loss — a colicky infant gains weight normally; failure to thrive points to an organic cause (inadequate feeding, cow's milk protein allergy, gastroesophageal reflux disease, or another medical illness).
Vomiting — especially forceful, projectile, or bile-stained (green) vomiting, which raises concern for pyloric stenosis or a bowel obstruction and needs urgent assessment.
Blood in the stool — suggests an anal fissure (usually visible on inspection and benign), cow's milk protein allergy/proctocolitis, or, rarely, a more serious gastrointestinal process.
Fever — a well-appearing colicky infant is not febrile; fever in a young infant needs prompt medical evaluation for infection (urinary tract infection, otitis media, bacteremia, meningitis) regardless of a coexisting crying pattern.
Lethargy, poor feeding, or a change in level of alertness — never attributable to colic; evaluate urgently for sepsis, meningitis, or another serious illness.
Crying onset after 4 months of age, a pattern that changes in character, or a specific abnormal examination finding (a swollen digit, a red or irritated eye, abdominal distension, an inguinal or scrotal bulge) — see Assessment & Diagnosis for the specific conditions these can indicate.

Unresolved parental exhaustion and frustration during a colic episode is itself a red flag, not only a comfort issue — unexplained, inconsolable infant crying is the single most common trigger reported before an episode of abusive head trauma (shaken baby syndrome).^[4] If a caregiver discloses feeling at risk of losing control, expresses frustration that frightens them, or if a pharmacist has any concern for the infant's safety, this needs an immediate, direct, non-judgmental response and connection to urgent support — see Non-Pharmacologic Treatment for the specific safe-coping messaging to give every caregiver of a crying infant, not only ones who disclose distress.

Assessment & Diagnosis

Diagnosis of exclusion

There is no test that confirms colic — the diagnosis rests on a classic history (the Rule of Threes), a normal growth trajectory, and a normal physical examination, with organic causes actively considered and reasonably excluded rather than never considered.^[1]^[2] A full, undressed physical examination — including the abdomen, groin and genitalia, all digits (fingers and toes), and a look at both eyes — is a necessary part of every colic assessment, not an optional step, because several of the organic mimics below are found only on direct inspection.

Conditions to actively screen for before labelling crying as colic

Condition	Suggestive clue	Practical screening point
Cow's milk protein allergy/intolerance	Blood or mucus in the stool, eczema, significant vomiting or feeding refusal, a family history of atopy, symptoms present alongside (not only during) crying episodes	Consider a maternal dietary elimination (breastfed) or hydrolyzed-formula trial (formula-fed) only when these specific clues are present — see Choose Initial Treatment.^[2]
Gastroesophageal reflux disease	Frequent, forceful spit-up together with feeding refusal, arching, or poor weight gain	Ordinary "happy spitting" without these features does not need investigation or treatment; do not treat colic empirically with acid suppression (see Common Errors to Avoid).
Infection (urinary tract infection, otitis media, meningitis, bacteremia)	Fever, lethargy, poor feeding, vomiting	Any fever in a young infant needs prompt medical evaluation independent of the crying pattern.
Hair tourniquet syndrome	A finger, toe, or occasionally the genitals, with new redness, swelling, or a visible constricting band	Inspect all digits (and the genitalia in a female infant) — this is easily missed under a sock or mitten and is a genuinely reversible, urgent cause of severe unexplained crying.^[5]
Corneal abrasion or an eyelash/foreign body in the eye	Excessive tearing, eye rubbing, redness, light sensitivity, or asymmetric eye findings	A brief look at both eyes is a fast, easily overlooked screening step.
Anal fissure	Pain and crying specifically with defecation, a visible streak of bright red blood on the stool surface	Usually visible on gentle inspection of the perianal area; managed conservatively, not as colic.
Incarcerated inguinal hernia or testicular torsion	A groin or scrotal bulge, or scrotal swelling/discolouration, especially with sudden severe distress	A time-sensitive surgical emergency — examine the groin and genitalia at every colic assessment.
Occult trauma/non-accidental injury	Bruising (especially patterned bruising, or any bruising in a non-mobile infant), swelling, asymmetric limb movement, or distress out of proportion to any visible finding	Maintain a low threshold to examine fully and to ask directly, non-judgmentally, about the safety of the caregiving environment.

Investigations

No laboratory testing or imaging is routinely needed when the history fits the Rule of Threes, growth is normal, and the examination (including the full-body screen above) is reassuring — over-investigating a well, thriving infant adds cost and parental anxiety without benefit.^[2] Direct any testing specifically at whichever red flag or differential-diagnosis clue is actually present (for example, a urinalysis for fever, or stool inspection/testing for visible blood) rather than ordering a generic "colic work-up."

Treatment Targets

Confirm colic is genuinely a diagnosis of exclusion for this infant — actively screen for and rule out the organic causes above before reassuring a family that "it's just colic."
Provide accurate, validating parental education: colic is common, not the parent's fault, not a sign of poor parenting or inadequate feeding, and reliably resolves by 3-4 months.
Reduce crying duration where a genuine evidence-based intervention applies (a trial of Lactobacillus reuteri in a breastfed infant; a dietary trial only when cow's milk protein allergy is specifically suspected) — without creating a cascade of ineffective product trials or unnecessary formula switches.
Protect parental mental health and infant physical safety — screen for caregiver exhaustion, frustration, and depressive symptoms, and give every caregiver explicit, practical safe-coping strategies for moments of overwhelming crying.
Support continued breastfeeding where the parent wishes to continue it, rather than letting a mistaken belief that breast milk itself is causing the colic end breastfeeding prematurely.
Avoid harm from ineffective or unsafe interventions — simethicone, dicyclomine and other anticholinergics, gripe water, and reflexive acid-suppression or formula-switching cascades.

Choose Initial Treatment

Direct treatment rule

Foundation of management

1st line, every infant confirm the diagnosis of exclusion (see Assessment & Diagnosis), then provide direct parental education and reassurance: explain the Rule of Threes, the expected resolution by 3-4 months, and that colic reflects a normal, self-limited crying pattern rather than an illness, inadequate feeding, or a parenting failure.^[1]^[3] Pair this with the soothing techniques and, critically, the explicit safe-coping guidance in Non-Pharmacologic Treatment for every caregiver — not only ones who appear distressed.^[4]

A modest, selective role for pharmacotherapy

Consider — breastfed infants a 3-week trial of Lactobacillus reuteri DSM 17938, the probiotic strain with the most consistent trial evidence for infant colic; an individual-patient-data meta-analysis found a clinically meaningful reduction in crying/fussing time specifically in breastfed infants, with no comparable benefit demonstrated in formula-fed infants.^[6]^[7] Set expectations honestly: benefit is real but modest and not universal, so this is a reasonable option to offer rather than a required intervention.

Consider — cow's milk protein allergy suspected only when a specific clue is present (blood/mucus in stool, eczema, a strong family atopy history, or significant vomiting/feeding refusal alongside the crying — see Assessment & Diagnosis), a time-limited trial of either maternal elimination of cow's milk protein (and other common allergens) for a breastfed infant, or a switch to an extensively hydrolyzed formula for a formula-fed infant, for about 1-2 weeks.^[2] Reassess objectively at the end of the trial; if there is no clear improvement, stop the trial and resume the usual diet/formula rather than continuing indefinitely or cycling through further formula changes.

What not to reach for

Avoid simethicone despite being one of the most widely used and marketed over-the-counter "colic drops," randomized trial evidence and a Cochrane systematic review show no benefit over placebo — this is an important, specific myth to correct with parents who are already using or planning to buy it.^[8]

Do not use dicyclomine or another anticholinergic despite older trials showing a genuine reduction in crying, dicyclomine carries a labelled contraindication under 6 months of age after case reports of apnea, seizures, syncope, and coma in young infants — its efficacy does not outweigh this safety signal, and it should not be used or recommended at any dose in this age group.^[8]

Do not switch to soy-based formula as a colic intervention — soy protein is itself a potential allergen and does not reliably improve crying.^[2]

Do not start empiric acid suppression (e.g., a proton pump inhibitor) for colic alone — trial evidence shows no benefit over placebo for crying/fussing time, and this treats a presumed diagnosis of gastroesophageal reflux disease that has not actually been established (see Assessment & Diagnosis).^[2]

Avoid gripe water and other unregulated herbal preparations — evidence of benefit is lacking, and formulations are inconsistently regulated; some marketed products have historically contained alcohol, sucrose, or sodium bicarbonate in amounts inappropriate for a young infant. Advise parents against relying on these products rather than remaining neutral about them.^[2]

Non-Pharmacologic Treatment

Soothing techniques

No single technique works for every infant, and effect sizes in trials are generally modest — offer these as a toolkit to try in combination, framed honestly as comfort measures rather than a cure:^[3]

Holding, close contact, and swaddling — a snug swaddle (arms in) can be calming for some infants; discontinue swaddling once the infant shows signs of rolling.
Motion — walking, gentle rocking, swaying, or a car ride.
Sound — white noise, a fan, or gentle shushing at a volume that roughly matches the infant's own crying.
Sucking — a pacifier, or continued feeding/nursing for comfort where appropriate.
A calm environment — dim lighting and a quiet space can reduce overstimulation during a crying episode.

Side or stomach positioning can be used only while the infant is awake and directly supervised, for soothing purposes — for actual sleep, always place the infant supine (on the back) in a crib or bassinet with no loose bedding, exactly as for any other infant, since prone or side sleep position materially increases the risk of sudden infant death syndrome regardless of colic.

Explicit safe-coping guidance — give this to every caregiver

Unexplained, inconsolable crying is the most common reported trigger preceding an episode of abusive head trauma (shaken baby syndrome), and colic — by definition a period of frequent, prolonged, difficult-to-console crying — is a recognized situational risk factor.^[4] This makes explicit, practical coping guidance a core part of colic counselling for every family, not an optional add-on reserved for caregivers who already seem overwhelmed:

It is safe, appropriate, and recommended to place the infant safely on their back in the crib and step into another room for a few minutes if a caregiver feels their frustration building — a briefly crying infant alone in a safe crib is not being harmed; a shaken infant can be permanently injured or killed.
Never shake, hit, throw, or otherwise handle an infant roughly out of frustration, even briefly and even if it seems minor — shaking can cause permanent brain injury or death within seconds.^[4]
Arrange planned breaks — a partner, family member, friend, or paid support taking a shift — before exhaustion peaks, rather than waiting until a caregiver is at their limit.
Normalize seeking help explicitly: frustration with a crying infant is a common, expected experience, not a parenting failure, and asking for support is a sign of good judgment, not inadequacy.
Screen for postpartum depression and anxiety at colic-related contacts — colic is associated with worse parental mental health, and unaddressed depression or anxiety in turn makes the crying harder to cope with, a cycle worth naming explicitly and interrupting early.
If a caregiver discloses fear of losing control, or a pharmacist has any concern for the infant's immediate safety, respond directly and without judgment, and help connect the family to urgent support (their primary care team, a public health nurse, a crisis or parent-support line, or emergency services if there is immediate risk) — do not treat this disclosure as something to quietly note and move past.

Patient education

Explain the Rule of Threes and the expected resolution timeline in plain language, and proactively correct the specific, common myths: that colic means something is medically wrong, that it means the parent is doing something wrong, that switching formula repeatedly will likely fix it, or that gas-relief drops are known to work. Reinforce that a normal weight-gain trajectory and a well-appearing infant between episodes are reassuring signs the family can watch for themselves, and give a clear plan for what would prompt a return visit (see Red Flags & Refer and Treatment Failure/Next Step).

Pharmacologic Treatment Options

Drug / intervention	Role	Dose / use	Important adverse effects	Teaching points
Lactobacillus reuteri DSM 17938 Consider	Breastfed infants with ongoing significant distress, after a genuine trial of reassurance/soothing	5 drops PO once daily for a 3-week trial	Generally well tolerated; no significant adverse effects reported in trials	Benefit is specific to breastfed infants; no consistent benefit shown when formula-fed. Strain-specific — not evidence that 'probiotics' in general help colic.
Maternal dairy elimination (breastfed) or extensively hydrolyzed formula (formula-fed) Consider	Only when a specific cow's milk protein allergy clue is present (see Assessment & Diagnosis)	Trial for about 1-2 weeks, then reassess objectively	Maternal elimination diet: risk of inadequate calcium/vitamin D intake if prolonged without dietary guidance. Hydrolyzed formula: significantly higher cost; bitter taste may reduce acceptance	Reserve for a specific CMPA clue rather than trialing empirically in every colicky infant; stop if no clear improvement rather than continuing indefinitely.
Simethicone Avoid	Not recommended — no benefit shown over placebo	No effective dose established for colic	Generally well tolerated but ineffective for this indication	One of the most widely marketed OTC 'gas drops' for colic — an important, specific myth to correct with parents already using or planning to buy it.
Dicyclomine Avoid	Contraindicated under 6 months of age	No safe dose in this age group	Apnea, seizures, syncope, and coma reported in young infants — labelled contraindication under 6 months	Despite genuine efficacy for crying shown in older trials, the safety signal makes this an absolute avoid, not a risk-benefit judgment call.
Proton pump inhibitors (e.g., omeprazole) Avoid	Not recommended for colic without confirmed gastroesophageal reflux disease	No colic-specific dose; do not initiate for crying alone	Same class adverse-effect profile as in older patients; unnecessary exposure if GERD is not actually present	Trial evidence shows no benefit over placebo for crying/fussing time when used empirically for colic.
Gripe water and other herbal colic preparations Avoid	Not recommended	No standardized or evidence-based dose	Inconsistent regulation; some formulations have historically contained alcohol, sucrose, or sodium bicarbonate	No quality evidence of benefit — advise against these products rather than remaining neutral about them.

Special Populations

Breastfed infants

Support continued breastfeeding — a mistaken belief that breast milk itself is causing the colic is a common reason breastfeeding is stopped prematurely, and there is no consistent evidence linking breastfeeding to more (or less) colic.^[2] Lactobacillus reuteri DSM 17938 has its best evidence specifically in this group (see Choose Initial Treatment). If a cow's milk protein allergy clue is present, trial maternal dietary elimination before considering a change to the infant's own feeding.

Formula-fed infants

Lactobacillus reuteri has not shown a consistent benefit in formula-fed infants and is not routinely recommended in this group.^[6] If a cow's milk protein allergy clue is present, an extensively hydrolyzed formula trial is the appropriate step — not a switch to soy formula, which is itself potentially allergenic and not shown to reliably help colic.^[2]

Preterm and low-birth-weight infants

The Rule of Threes was derived largely from healthy, term infants; crying patterns in preterm infants can differ, and this population also carries a higher baseline risk of an actual underlying medical issue. Keep a lower threshold for medical assessment rather than applying the standard colic framework by default.

Infants with additional developmental or medical vulnerability

Infants with a recognized medical condition, a history of prenatal substance or alcohol exposure, or other special care needs may genuinely cry more or differently than a typically developing infant — this does not mean the crying should be dismissed as ordinary colic, and the underlying condition should be assessed and managed on its own terms in parallel with standard colic counselling.

Caregivers with additional vulnerability

Caregivers with limited social support, a personal history of depression, anxiety, or trauma, single parents, and parents of multiples carry a higher risk of both worsening mental health and infant-safety concerns during a colic episode.^[4] Proactively offer connection to community and public health resources in these situations rather than waiting for the caregiver to ask.

Monitoring & Follow-Up

Arrange a follow-up contact — by phone or in person, depending on severity and caregiver distress — within 1-2 weeks of the initial assessment, and sooner if a dietary or probiotic trial is underway or if caregiver coping is a concern.

Confirm the growth trajectory remains normal at each contact — this is the single most reassuring ongoing sign that the working diagnosis of colic remains correct.
Ask directly about caregiver coping, sleep, and mood at every contact, not only at the initial visit — colic-related distress can build over the following days to weeks even if it was not prominent initially.^[4]
Reassess for any new red flag (see Red Flags & Refer) at each contact, since colic is diagnosed provisionally and should be actively reconsidered, not assumed to remain correct indefinitely.
If a time-limited trial (probiotic, maternal elimination diet, or hydrolyzed formula) was started, confirm at follow-up whether it is being continued appropriately and whether it should be stopped on schedule if not clearly helping.
Confirm breastfeeding is continuing if the parent wishes it to, and address any misattribution of the colic to breast milk directly.
Track the outcomes that matter most for this condition: crying duration trending down over time, normal growth, and stable or improving caregiver wellbeing — not only whether the crying has stopped completely, which may not happen until closer to 3-4 months regardless of intervention.

Treatment Failure / Next Step

Re-confirm the diagnosis first: repeat the full undressed examination and re-screen the differential-diagnosis table in Assessment & Diagnosis for a clue that may have been missed initially (a hair tourniquet, a corneal finding, a hernia, blood in the stool).
If a probiotic, maternal-elimination, or hydrolyzed-formula trial was started and there is no clear improvement after its planned duration, stop the trial and return to the usual diet/formula rather than continuing indefinitely or moving on to a further unproven product.
If crying is escalating in severity, changing in character, or accompanied by any new red-flag finding, refer for prompt medical assessment rather than continuing reassurance alone.
If crying persists essentially unchanged beyond 4-5 months of age, this is outside the expected natural history — refer for reassessment rather than continuing to label it as ongoing colic.
If caregiver frustration, exhaustion, or mood symptoms are worsening — regardless of how the infant's crying itself is trending — escalate support directly: this is its own treatment priority, not something to defer until the infant's symptoms improve.
If a caregiver ever discloses fear of losing control or any concern for the infant's immediate safety, treat this as urgent regardless of where the workup otherwise stands, and connect them to immediate support.

Common Errors to Avoid

Labelling crying as colic without a full undressed examination — missing a hair tourniquet, a corneal abrasion, an incarcerated hernia, or a fissure has real, sometimes urgent, consequences.
Recommending or endorsing simethicone as a way to help colic — trial evidence shows no benefit over placebo despite how widely it is marketed and used for this purpose.^[8]
Recommending or dispensing dicyclomine (or another anticholinergic) for colic in an infant under 6 months of age — this is a labelled contraindication given real reports of apnea, seizures, and coma, not a case-by-case judgment call.^[8]
Encouraging repeated formula switches without a specific cow's milk protein allergy clue present — this adds cost and disrupts feeding without evidence of benefit.
Recommending soy formula as a colic remedy — it is itself potentially allergenic and not shown to reliably help.^[2]
Treating colic empirically with a proton pump inhibitor or other acid suppression without an actual gastroesophageal reflux disease diagnosis.^[2]
Telling a breastfeeding parent that their milk is likely causing the colic and colic is a reason to stop breastfeeding — there is no consistent evidence for this, and it can end breastfeeding prematurely for no benefit.
Treating parental reassurance as a one-time conversation rather than an ongoing part of every follow-up contact through the natural course of colic.
Failing to ask directly about caregiver coping and mental health, or assuming a caregiver who seems calm does not need the safe-coping/"never shake" messaging — give it to every caregiver of a crying infant, not only ones who appear distressed.^[4]
Treating an infant whose crying began after 4 months of age, or that has not improved by 4-5 months, as ordinary colic rather than reassessing for an organic cause.

Clinical Decision Algorithm

Algorithm A — Confirming the diagnosis

Infant with frequent, prolonged, difficult-to-console crying

Full undressed examination (abdomen, groin/genitalia, all digits, both eyes) plus history; check growth trajectory and feeding

A red flag (poor weight gain, vomiting, blood in stool, fever, lethargy) or a specific differential-diagnosis clue is found (e.g., hair tourniquet, corneal finding, hernia, fissure, CMPA/GERD clue)

Not simple colic — investigate or treat the specific finding, or refer urgently

No red flag; pattern fits the Rule of Threes; growth and exam normal

Infantile colic (a diagnosis of exclusion) confirmed — proceed to Algorithm B^[1]

Algorithm B — Management

Confirmed infantile colic

Educate and reassure: explain the Rule of Threes and expected resolution by 3-4 months; teach soothing techniques; give explicit safe-coping guidance to every caregiver^[3]^[4]

Breastfed, with ongoing significant distress after a genuine trial of reassurance/soothing

Consider a 3-week trial of Lactobacillus reuteri DSM 17938^[6]

A specific cow's milk protein allergy clue is present (blood/mucus in stool, eczema, strong atopy history)

Consider a 1-2 week trial: maternal dairy elimination (breastfed) or extensively hydrolyzed formula (formula-fed)^[2]

No specific clue present; caregiver coping well

Continue reassurance and soothing techniques alone; avoid simethicone, dicyclomine, and other unproven or unsafe products^[8]

Improves, or resolves by 3-4 months as expected

Continue supportive care; no further intervention needed

No improvement, a red flag emerges, crying persists past 4-5 months, or caregiver distress is escalating

Reassess the differential diagnosis, stop any ineffective trial, and escalate support — including urgent referral for caregiver mental health or infant-safety concerns^[4]

Drug Tables

How to use this table: pharmacotherapy has a genuinely limited role in infantile colic — reassurance, soothing technique, and explicit caregiver safe-coping guidance (see Non-Pharmacologic Treatment) remain first-line for every infant. Select any linked drug name to open its complete Pharmasist Drug Database page.

Interventions with genuine, though modest, supporting evidence

Offer as options within a shared decision, not as required treatment — reassurance, soothing technique, and time remain the foundation of management for every infant.

Drug/intervention	Dosage	Adverse effects	Drug interactions	Comments
Lactobacillus reuteri DSM 17938	Breastfed infants: 5 drops PO once daily for a 3-week trial	Generally well tolerated; no significant adverse effects reported in trials	None significant reported	Benefit is specific to breastfed infants; no consistent benefit in formula-fed infants. Strain-specific finding — do not extrapolate to other probiotic strains or products.
Maternal low-allergen diet (breastfeeding)	Trial: Eliminate cow's milk (and other common allergens as indicated) from the maternal diet for about 1-2 weeks, then reassess	Risk of inadequate maternal calcium/vitamin D intake if the elimination is prolonged without dietary guidance	None significant	Reserve for a specific cow's milk protein allergy clue (blood/mucus in stool, eczema, strong atopy history) rather than trialing in every colicky breastfed infant; reassess and stop if no clear benefit.
Extensively hydrolyzed formula (formula-fed)	Trial: Switch to an extensively hydrolyzed formula for about 1-2 weeks, then reassess	Bitter taste may reduce acceptance; significantly higher cost than standard formula	None significant	Reserve for a specific cow's milk protein allergy clue; a 1-2 week trial with objective reassessment, not an indefinite or repeated series of formula changes.

Agents to avoid

Included because caregivers frequently ask about, or are already using, these products — not because any is recommended.

Drug/intervention	Dosage	Adverse effects	Drug interactions	Comments
Simethicone	Colic-specific dosing: No effective dose established	Generally well tolerated but ineffective for this indication	None significant	No benefit over placebo in randomized trials and a Cochrane review, despite being one of the most widely marketed OTC 'gas drops' for colic.
Dicyclomine	Colic use: Not recommended at any dose under 6 months of age	Apnea, seizures, syncope, coma reported in infants — labelled contraindication under 6 months of age	Additive CNS/respiratory depression with other sedating drugs	Despite genuine efficacy for crying shown in older trials, the safety signal makes this an absolute avoid under 6 months, not a risk-benefit judgment call.
Proton pump inhibitors (e.g., omeprazole)	Colic-specific dosing: Not recommended for colic alone	Same class adverse-effect profile as in older patients (headache, GI upset); unnecessary exposure if GERD is not actually present	Multiple CYP2C19-mediated interactions — see the drug's own monograph	No benefit over placebo for crying/fussing time when used empirically for colic without a confirmed gastroesophageal reflux disease diagnosis.
Gripe water and other herbal colic preparations	Colic-specific dosing: No standardized or evidence-based dose	Inconsistent regulation; some formulations have historically contained alcohol, sucrose, or sodium bicarbonate in amounts inappropriate for a young infant	Variable and often unlabelled, depending on formulation	No quality evidence of benefit — advise against these products rather than remaining neutral about them.

References

Paroxysmal fussing in infancy, sometimes called colic — Pediatrics (Wessel MA, Cobb JC, Jackson EB, Harris GS Jr, Detwiler AC). Pediatrics 1954;14(5):421-435
Infantile Colic: Recognition and Treatment — American Family Physician (Johnson JD, Cocker K, Chang E). Am Fam Physician 2015;92(7):577-582
Colic and crying — Canadian Paediatric Society, Caring for Kids. Caring for Kids patient handout, last updated January 2021
Crying as a trigger for abusive head trauma: a key to prevention — Pediatric Radiology (Barr RG). Pediatr Radiol 2014;44(Suppl 4):S559-564
Hair tourniquet syndrome of toes and fingers in infants — Acta Orthopaedica et Traumatologica Turcica (Aslantürk O, Özbey R, Yılmaz Ö, Ergen E). Acta Orthop Traumatol Turc 2019;53(4):306-309
Lactobacillus reuteri to Treat Infant Colic: A Meta-analysis — Pediatrics (Sung V, D'Amico F, Cabana MD, et al.). Pediatrics 2018;141(1):e20171811
Using probiotics in paediatric populations — Paediatrics & Child Health, Canadian Paediatric Society (Schneider R, Sant'Anna A). Paediatr Child Health 2022;27(8):482-491
Pain-relieving agents for infantile colic — Cochrane Database of Systematic Reviews (Biagioli E, Tarasco V, Lingua C, Moja L, Savino F). Cochrane Database Syst Rev 2016;9:CD009999

Professional reference only. Apply clinical judgment and verify patient-specific decisions against current authoritative guidance and product information.