Lymphogranuloma Venereum

Clinical Snapshot

Lymphogranuloma venereum (LGV) is caused by the invasive Chlamydia trachomatis serovars L1, L2, and L3, which preferentially infect lymphatic tissue rather than the epithelium the way ordinary genital chlamydia does. It is transmitted through vaginal, anal, or oral sexual contact. LGV needs a much longer treatment course than uncomplicated chlamydia — 3 weeks rather than 7 days — because of this deeper tissue invasion, and untreated infection can leave permanent structural damage.^[1]

Recognize the Condition

Suspect LGV specifically in a patient (particularly men who have sex with men) presenting with proctitis symptoms, especially with bloody anal discharge — this is the presentation most likely to be missed as "just" ordinary proctitis or hemorrhoids.
Can also present with genital ulceration or inguinal lymphadenopathy at the site of inoculation.
Individuals with genital ulcers from any cause, including LGV, are at increased risk of acquiring and transmitting HIV.

Complications of untreated infection include anorectal fissures, fistulae, and strictures, along with secondary bacterial infection of the affected tissue — these are the consequences of the deeper lymphatic invasion that distinguishes LGV from ordinary chlamydia.

Risk Factors

Receptive anal intercourse, particularly in men who have sex with men.
A sexual partner with confirmed or suspected LGV.
Other concurrent STI exposure.

Red Flags & Refer

Refer for any of the following:

Established anorectal strictures, fistulae, or fissures — may need surgical assessment in addition to antibiotic treatment.
Proctitis and bloody anal discharge whose initial gonorrhea/chlamydia testing does not explain the picture — consider LGV and refer for reference-laboratory testing if not immediately available locally.

Assessment & Diagnosis

Testing for LGV is typically performed at a reference laboratory and sometimes needs a specific request rather than being part of routine chlamydia testing. If a rectal specimen is positive for chlamydia, test specifically for LGV serovars — in some jurisdictions a positive rectal chlamydia NAAT automatically triggers LGV serovar testing, in others it must be requested explicitly, so know your local laboratory's practice. LGV testing on non-rectal specimens (culture or NAAT) can also be done when suspected, for example with genital lesions; serology is not generally recommended for diagnosis.^[1]

Treatment Targets

Eradicate the infection and prevent progression to stricture, fistula, or fissure formation.
Eradicate infection in sexual partners from the relevant exposure window.
Resolve proctitis or ulcerative symptoms.

Choose Initial Treatment

Direct treatment rule

Use doxycycline 100 mg PO BID for 3 weeks as the preferred regimen — this is 3 times longer than the standard chlamydia course, reflecting the deeper tissue invasion of the LGV serovars. Do not treat LGV with a standard 7-day chlamydia course.^[1]

Non-Pharmacologic Treatment

Refer sexual partners from the 60 days preceding symptom onset (or diagnosis, if the patient was asymptomatic) for testing and empiric treatment.
Advise abstaining from sexual contact until the patient and treated partner(s) have completed therapy.

Pharmacologic Treatment Options

Drug / intervention	Role	Dose / use	Important adverse effects	Teaching points
Doxycycline (case treatment) Preferred	Case treatment — 3 times longer than the standard chlamydia course	100 mg PO BID for 3 weeks	GI upset, rash, candidal vaginitis, photosensitivity	Contraindicated in pregnancy and breastfeeding. Test of cure 3-4 weeks after completion.
Doxycycline (empiric partner treatment) Preferred	Empiric treatment of exposed partners	100 mg PO BID for 7 days	Same as above	Switch to the full 3-week case-treatment course if the partner's own test confirms LGV.
Erythromycin base (case treatment) Alternative	Pregnancy/breastfeeding or doxycycline unavailable	500 mg PO QID for 3 weeks	GI upset; rare QT prolongation	Oral tablets/capsules no longer commercially available in Canada — a compounded course can be used.
Azithromycin (case treatment) Alternative	Last resort — doxycycline and erythromycin both contraindicated/unavailable	1 g PO once weekly for 3 weeks	GI upset; rare QT prolongation	Efficacy data more limited than doxycycline, though a trial found it comparably effective for LGV proctitis specifically.
Azithromycin (empiric partner treatment) Alternative	Empiric treatment of exposed partners	1 g PO as a single dose	Same as above	Shorter empiric option for exposed partners.

Do not undertreat: LGV needs the full 3-week case-treatment course, not the standard 7-day chlamydia course.^[2]

Special Populations

Pregnancy and breastfeeding: doxycycline is contraindicated. Erythromycin (not the estolate salt, due to cholestatic hepatitis risk) or azithromycin can be used instead, following the same 3-week case-treatment durations as outlined in Choose Initial Treatment.

Monitoring & Follow-Up

Perform test of cure 3-4 weeks after completing treatment.
Continue follow-up until chlamydial testing is negative — do not stop at a single negative result if the timing is borderline.
Monitor clinically for resolution of proctitis symptoms and for development of stricture or fistula, which can occur even after microbiological cure if tissue damage was already established.

Treatment Failure / Next Step

Confirm the full 3-week course was completed — a partial course is a common reason for apparent failure.
Confirm partner treatment and exclude re-exposure.
Repeat testing rather than assuming failure from symptoms alone, since post-infectious symptoms can persist even after cure.
Refer for surgical assessment if stricture, fistula, or fissure has developed.

Common Errors to Avoid

Treating LGV with the standard 7-day chlamydia course instead of the full 3-week LGV course.
Missing LGV in a patient with proctitis and bloody anal discharge by attributing symptoms to hemorrhoids or ordinary proctitis without testing.
Not requesting LGV-specific serovar testing on a positive rectal chlamydia result when your laboratory does not do this automatically.
Using doxycycline in pregnancy or breastfeeding.

Clinical Decision Algorithm

Rectal chlamydia: distinguishing LGV from uncomplicated infection

Positive rectal chlamydia NAAT, or proctitis with bloody anal discharge

LGV serovar testing positive, or strongly suspected clinically

Doxycycline 100 mg PO BID x 3 weeks (not the standard 7-day chlamydia course)

Empirically treat partners from the preceding 60 days: doxycycline 100 mg PO BID x 7 days, or azithromycin 1 g PO single dose

Test of cure at 3-4 weeks; follow up until chlamydial testing is negative

LGV serovar testing negative or not indicated

Treat as uncomplicated chlamydia — doxycycline 100 mg PO BID x 7 days (see Chlamydia chapter)

Drug Tables

How to use this table: Doses are adult doses and require patient-specific confirmation. Test and treat sexual partners from the preceding 60 days. Select any drug name to open its complete Pharmasist Drug Database page.

Tetracyclines — Preferred

3 weeks of treatment — much longer than the 7-day course used for uncomplicated chlamydia.

Drug	Dosage	Adverse effects	Comments
Doxycycline (case treatment) generics	100 mg PO BID x 3 weeks.	GI upset, rash, candidal vaginitis, photosensitivity.	Preferred regimen. Contraindicated in pregnancy and breastfeeding. Test of cure 3-4 weeks after completion.
Doxycycline (empiric partner treatment) generics	100 mg PO BID x 7 days.	Same as above.	Shorter empiric course for exposed partners; switch to the full 3-week case-treatment course if the partner's own test confirms LGV.

Macrolides — Alternative

For pregnancy/breastfeeding or when doxycycline cannot be used.

Drug	Dosage	Adverse effects	Comments
Erythromycin base (case treatment) Eryc, generics	500 mg PO QID x 3 weeks.	GI upset; rare QT prolongation.	Oral tablets/capsules no longer commercially available in Canada — a compounded course can be used. Can be used in pregnancy and breastfeeding; avoid the estolate salt in pregnancy.
Azithromycin (case treatment, last resort) Zithromax, generics	1 g PO once weekly x 3 weeks.	GI upset; rare QT prolongation.	Use specifically when doxycycline and erythromycin are both contraindicated or unavailable — clinical efficacy data are more limited than for doxycycline. Repeat the dose if vomiting occurs within 1 hour.
Azithromycin (empiric partner treatment) Zithromax, generics	1 g PO as a single dose.	Same as above.	Shorter empiric option for exposed partners.

Evidence note: Drug inventory, dosing, adverse effects, and comments reflect standard Canadian practice per current PHAC guidance.^[1]

References

Sexually transmitted and blood-borne infections: Guides for health professionals — Public Health Agency of Canada. Canadian Guidelines on Sexually Transmitted Infections
Effective treatment of Lymphogranuloma venereum proctitis with azithromycin — Clinical Infectious Diseases (Blanco JL, Fuertes I, Bosch J, et al.). Clin Infect Dis 2021

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