Truvada generic for PrEP: the tests matter as much as the tablet

Truvada generic is emtricitabine 200 mg with tenofovir disoproxil 300 mg, and as pre-exposure prophylaxis it is close to completely effective against sexually acquired HIV when taken as prescribed. The qualifier is the whole subject. Adherence is what decides the result: in the trials, people taking it four or more days a week had almost no infections, and the trials that looked like failures were the ones where the drug was collected and not swallowed. This is not a medicine that works when it is in the cupboard.

The tests that have to happen, and when

Before the first tablet: an HIV test, and it must be recent. Starting PrEP during undiagnosed acute HIV infection means treating the virus with two drugs instead of three, which is how resistance develops and how future treatment options are lost. Kidney function and hepatitis B status are checked at the same time, because tenofovir affects the kidneys and because stopping it abruptly in someone with hepatitis B can cause a flare.

Then every three months: HIV testing, a check for other sexually transmitted infections, and a renal check at least twice a year. That schedule is not administrative caution. It is the part of PrEP that catches a seroconversion early, catches the syphilis or gonorrhoea that PrEP does nothing about, and catches the small decline in kidney function that occasionally means stopping.

Daily, or 2-1-1

Daily dosing is one tablet at the same time each day, and it protects against both anal and vaginal exposure. Protection takes about seven days of daily dosing to establish for rectal exposure and around twenty days for vaginal tissue, which is the detail most often missed by someone who starts on Friday for the weekend.

The on-demand schedule — two tablets 2 to 24 hours before sex, one 24 hours after the first pair, one 24 hours after that — is supported for men who have sex with men and is not recommended for vaginal exposure, where the tissue drug levels do not reach the same concentration. It suits infrequent, plannable sex. It does not suit anyone who cannot reliably take the two follow-up doses, because the protection depends on them.

Prices by pack

Indicative prices in US dollars for the 200 mg / 300 mg fixed-dose tablet. Thirty tablets is a month of daily dosing.

What it does to the body

Most people notice nothing. Nausea, headache and tiredness in the first weeks are reported and usually settle. The two effects that are monitored rather than felt are a small reduction in kidney function, which reverses on stopping in almost all cases, and a small loss of bone mineral density in the first year that then stabilises.

Neither of those is a reason to avoid PrEP in a person at real risk of HIV; they are the reason for the three-monthly and six-monthly checks. Significant pre-existing renal impairment is a genuine contraindication, and nonsteroidal anti-inflammatories taken regularly add to the renal load.

What it does not protect against

Everything else. PrEP has no effect on gonorrhoea, chlamydia, syphilis, mycoplasma, hepatitis C, HPV or herpes, and rates of those infections tend to rise in people who stop using condoms after starting it. That is the honest counselling point, and it is the reason the three-monthly review includes a full screen rather than just an HIV test.

The practical consequence is that PrEP belongs alongside the rest of sexual-health care rather than instead of it. Chlamydia is treated with doxycycline, trichomonas and bacterial vaginosis with metronidazole, and genital herpes with valacyclovir — all stocked in the anti viral and antibiotics sections. Where the behaviour around risk is itself the thing the person wants to change — compulsive patterns, sex under the influence, decisions that are regretted afterwards — that is clinical work, described on the sessuologia clinica page, and the first consultation at this studio costs nothing.

Questions people actually ask

How soon am I protected?

About seven days of daily dosing for anal exposure, around twenty for vaginal. The 2-1-1 schedule protects from the double dose taken two to twenty-four hours before sex, and only for men who have sex with men.

What if I miss a dose?

Take it when you remember and carry on. Protection on daily dosing holds well at four or more tablets a week; it does not hold at two.

Can I stop and restart it?

Yes, and many people use it in periods rather than continuously. Stopping means continuing for two days after the last exposure, and restarting means the lead-in time again — plus an HIV test before the restart.

Does it replace condoms?

For HIV, it is more effective than condoms when taken properly. For every other sexually transmitted infection it does nothing at all, which is why the two are usually recommended together rather than as alternatives.

The label these figures come from

Dosing, the baseline and three-monthly testing schedule, renal and bone effects and the hepatitis B caution follow the FDA prescribing information for emtricitabine and tenofovir disoproxil fumarate and the CDC pre-exposure prophylaxis clinical guidelines. This page is information, not a prescription, and PrEP without the testing around it is not PrEP.