Question
Will taking PrEP late work with on demand dosing?
27 April 2020. Related: All topics, PrEP.
Hi, I take PrEP with on demand dosing and after having sex after my first double dose i remembered my first dose post sex on time. However, my second dose was 5h late and 3rd dose was 5h late too. Will this affect my level of protection and should i continue taking it 5h late every day?
Answer
Hi
Thanks for your question. The easy answer is that you will probably be fine.
Both the drugs in PrEP stay in your body to allow for a few hours being late with dosing.
It is better to try to take them at the right time.
The after sex doses with on demand dosing only need to be taken 24 hours and 48 hours after the first double dose. Taking an extra dose for a third day will not do any harm though.
If you are still having sex every day though, then continue taking PrEP until 24 and 48 hours after the last time you had sex.
More information on real life examples for on demand dosing.
Hello Addlove and thanks for getting in touch.
Having sex includes risks, you seem to know all about it.
Well done that you are so careful and follow up with often testing and treatment as needed.
PrEP works best if taken up to 2 hours before sex.
Afte sex, you should ideally go on PEP.
If you could not get PEP on the day, well done for starting PrEP.
It’s always better to take something (ideally PEP) than nothing and well done for taking it straight away after exposure.
I feel you could benefit by taking PrEP in the future – you have the option to take it daily or on demand depending on your risk.
Please see here for more information: https://i-base.info/uk-guide-to-prep/
Hi, I have sex with sex worker. We used a condom but it broke. I started PrEP within two hours. I was diagnosed with an STI a few days later. What is my risk for HIV?