Quick Answer

Treatment duration varies dramatically: single-dose cures exist for trichomoniasis (2g metronidazole) and sometimes gonorrhea (one ceftriaxone shot); chlamydia needs 7 days of doxycycline; syphilis requires 1–3 weekly penicillin injections depending on stage; and viral suppression runs from outbreak-length courses to lifelong daily regimens.

  • Fastest complete cures: trichomoniasis — one dose, done.
  • Standard bacterial course: chlamydia's 7-day doxycycline outperforms single-dose alternatives per current guidelines.
  • Syphilis staging determines injections: one for early stages, three weekly doses for late latent.
  • Hepatitis C: 8–12 weeks of daily pills curing >95% permanently.

The Landscape

Duration reflects organism biology and location: bloodstream-dwelling spirochetes need sustained penicillin levels; intracellular chlamydia demands covering multiple replication cycles; viruses integrated into genomes resist any finite course.

Symptoms versus completion

Feeling better happens days before organisms clear — stopping early breeds resistance and relapse. Finish every prescribed course regardless of symptom resolution.

Timelines for sex resumption

Wait 7 days after single-dose treatments and until finishing multi-day courses before unprotected contact — plus partner treatment, or ping-pong reinfection undoes everything.

Treatment Windows by Infection

Bacterial infections clear with antibiotics measured in days: single-dose azithromycin or a ceftriaxone shot for gonorrhea, seven days of doxycycline for chlamydia, penicillin injections for syphilis staged by duration. Viral infections play a longer game — suppressive antivirals for herpes, daily ART driving HIV to undetectable, and 8–12-week antiviral courses curing over 95% of hepatitis C cases.

⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.