Preventive Plan Combining Regular STI Screening and Doxy-PEP — A Practical Guide for MSM | Mona Aoyama Clinic
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August 6, 2026
Prevention Plan Combining Regular STI Testing with DoxyPEP—A Practical Guide for MSM
“Is regular testing unnecessary if I’m using DoxyPEP?” “When and what tests should I get?” “I’m also using PrEP, so how should I combine everything?”—I often receive these questions from people who have started using DoxyPEP.
While DoxyPEP is a powerful preventive tool, it does not offer 100% prevention, and there are infections it cannot prevent, such as HIV and herpes. Combining it with regular testing allows for early detection and treatment of infections, protecting your and your partner's long-term health.
In this article, a doctor from Mona Aoyama Clinic practically explains the testing schedule, test items, and how to combine DoxyPEP with PrEP for those using DoxyPEP.
- DoxyPEP prescription + regular STI testing available online
- Mail-in test kits allow for testing from home
- Plans combining PrEP and PEP are also offered
Why Regular Testing is Always Paired with DoxyPEP
- DoxyPEP's prevention rate is not 100%: Approximately 70-90% for chlamydia, 70-80% for syphilis, 50-60% for gonorrhea. The remaining risk can only be detected through testing.
- Ineffective against HIV, herpes, etc.: These require testing and other preventive measures.
- Infections often show no symptoms: Approximately 70-80% of chlamydia cases are asymptomatic. Waiting for symptoms to appear can lead to the spread of infection.
- Early detection of resistant strains: If an infection occurs despite DoxyPEP use, it is necessary to check for the involvement of resistant strains.
- Using DoxyPEP while infected increases the risk of resistant strains: It is important to confirm that an infection has not been established before use.
Recommended Testing Schedule (for MSM and DoxyPEP Users)
| Frequency | Test Items | Notes |
|---|---|---|
| Every 3 months (recommended) | HIV, Syphilis, Chlamydia (urethral, pharyngeal, rectal), Gonorrhea (urethral, pharyngeal, rectal) | Basic screening for MSM recommended by the CDC |
| Every 6 months | Hepatitis B (if unvaccinated), Hepatitis C, Liver function tests | Depending on vaccination status |
| Annually | General health check-up, Blood tests | Monitoring underlying conditions, side effects of medication |
| As needed if symptoms occur | Tests appropriate to symptoms (secretions, ulcers, rashes, etc.) | If symptoms appear, seek medical attention without waiting 3 months. |
📋 "Testing every 3 months" is the standard schedule for MSM recommended by the CDC guidelines. By adhering to this schedule while using DoxyPEP, early detection of infections and confirmation of preventive effectiveness are possible.
Testing Sites—"Where to Collect Samples" is Important
Sexually transmitted infections (STIs) infect different sites depending on the type of sexual activity. Testing only the urethra can lead to missed infections.
| Type of Sexual Activity | At-risk site for infection | Testing site |
|---|---|---|
| Anal sex (receptive) | Rectum | Rectal swab |
| Oral sex (receptive) | Pharynx (throat) | Pharyngeal swab |
| Vaginal sex, Anal sex (insertive) | Urethra | Urethral swab, Urinalysis |
By undergoing multi-site testing depending on the type of sexual activity, you can avoid missing infections. Our clinic offers multi-site sample collection using mail-in test kits.
Prevention Plan for PrEP Users
For PrEP users, HIV prevention is already covered to a high standard. Adding DoxyPEP creates a comprehensive prevention plan that also covers chlamydia, syphilis, and gonorrhea.
| Medication/Measure | Purpose | Frequency |
|---|---|---|
| PrEP | HIV prevention | Daily continuous use |
| DoxyPEP | Chlamydia, Syphilis, Gonorrhea prevention | Once within 72 hours of risky sexual activity |
| Condoms | HIV, STI, pregnancy prevention | Use if possible |
| Regular STI testing | Early detection of infection, confirmation of resistant strains | Every 3 months |
| Hepatitis B vaccine | Hepatitis B prevention | Recommended if unvaccinated |
| HPV vaccine | HPV, genital warts, certain cancer prevention | Recommended if unvaccinated |
How to Choose a Prevention Plan That Suits You
- Frequency of sexual activity/number of partners: The more frequent, the more effective a regular DoxyPEP plan. Monthly regular plans can help reduce costs.
- Degree of HIV risk: Consider adding PrEP if HIV risk is high.
- History of infection: DoxyPEP is especially recommended for those who have been infected with syphilis or chlamydia within the past 12 months.
- Balance with cost: Bulk purchasing or regular plans can reduce the cost per use.
Please consult with us via online medical care regarding a prevention plan tailored to your situation.
Frequently Asked Questions
Testing is still necessary. DoxyPEP does not prevent 100% of infections and is not effective against HIV, herpes, etc. Regular testing is essential for early detection of infections and to confirm that DoxyPEP is working correctly.
Our clinic offers mail-in test kits that cover multiple sites, including the urethra, pharynx, and rectum. Please consult with us during your online medical consultation for more details.
Our clinic also handles prescriptions for treatment medications online. We prescribe appropriate antibiotics for chlamydia, syphilis, and gonorrhea. We can manage both testing and treatment.
Before starting, we recommend testing for HIV, syphilis, chlamydia, and gonorrhea (urethral, pharyngeal, rectal). This is because using DoxyPEP when an infection is already present can increase the risk of resistant strains. Our clinic provides guidance on testing prior to prescription.
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| Clinic Name | Mona Aoyama Clinic |
| Consultation Format | Online Consultation (nationwide coverage) / In-person Consultation (Tokyo, Aoyama) |
| Location | D Building 3F, 1-10-3 Minami Aoyama, Minato-ku, Tokyo 107-0062 |
| Nearest Station | 5-minute walk from Tokyo Metro "Aoyama-itchome Station" |
| Online Consultation | 24-hour reception / Same-day shipping available (for payments made by 4 PM) |
Please consult us about a DoxyPEP + regular testing plan.
Online medical care available nationwide. Comprehensive support from prescription to regular testing.