Post-Exposure Prophylaxis for STIs: Key Questions and Dietary Guidelines

Post-Exposure Prophylaxis (PEP) for Sexually Transmitted Infections (STIs)

Hello Doctor, I would like to ask about my situation.
I had unprotected vaginal intercourse with an unfamiliar woman (without a condom and with ejaculation) and took PEP medication 25 hours later.
I also had blood tests for possible STDs or hepatitis while on Tenofovir.
Are there any foods I should avoid? Specifically, will regular foods like fresh milk, milk, bread, or sugary drinks have any impact? I would also like to know if the likelihood of contracting HIV after completing the medication is relatively low.
Additionally, does the hepatitis B vaccine I received in childhood still provide some level of protection? Thank you, Doctor, for taking the time to respond.

TTO, 20~29 year old female. Ask Date: 2024/02/20

Dr. Liao Zhongxin reply Internal Medicine

1.
There are no dietary restrictions while using the guitar vein; it can be used at any time or not used at all.

2.
The protective effect of the hepatitis B vaccine diminishes over time; if you are required to work in a healthcare facility, it is recommended that you get tested at a nearby medical institution to see if you need a booster dose of the hepatitis B vaccine.

Reply Date: 2024/02/20

More Info

Post-Exposure Prophylaxis (PEP) for sexually transmitted infections (STIs) is a critical intervention for individuals who may have been exposed to HIV. It is essential to understand the implications of PEP, including dietary considerations and the effectiveness of the treatment.

Firstly, PEP is most effective when started within 72 hours of potential HIV exposure. Since you mentioned starting PEP 25 hours after exposure, you are within the window for effective intervention. The standard PEP regimen typically involves taking antiretroviral medications for 28 days. Adherence to the medication schedule is crucial for maximizing its effectiveness.

Regarding dietary guidelines while on PEP, there are no specific foods that are universally prohibited. However, it is advisable to maintain a balanced diet to support your immune system and overall health during this period. Foods that are high in sugar, processed foods, and excessive alcohol should generally be avoided, as they can negatively impact your immune response and overall well-being.
In terms of specific foods like fresh milk, regular milk, bread, and sugary drinks, these are typically safe to consume while on PEP. However, if you have any lactose intolerance or allergies, you should avoid those specific items. It is always a good idea to consult with your healthcare provider or a nutritionist for personalized dietary advice, especially when on medication.

As for the risk of contracting HIV after starting PEP, if taken correctly and consistently, the risk is significantly reduced. However, it is important to note that PEP is not 100% effective, and regular follow-up testing is necessary to confirm your HIV status after completing the regimen.
Regarding your vaccination history, receiving the hepatitis B vaccine in childhood provides a level of protection against hepatitis B infection. However, it is essential to check your vaccination records and consult with your healthcare provider to determine if you are adequately protected. If you are unsure about your vaccination status or if you need a booster, your healthcare provider can guide you on the appropriate steps.

In summary, while on PEP, focus on maintaining a healthy diet, adhere strictly to your medication regimen, and follow up with your healthcare provider for testing and further guidance. If you have any specific concerns about your diet or health during this time, do not hesitate to reach out to your healthcare provider for tailored advice.

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