Concerns About Delayed Dosing of HIV Medication and Its Effectiveness - Urology

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Inquiry about HIV infection and deviation from the scheduled dosage of Sufentanil extended-release tablets?


Hello doctor, I recently had an encounter with a female sex worker.
I used a condom throughout the entire process, but my fingers came into contact with her bodily fluids.
My fingers had no cuts, and after the fluids had mostly dried (about two to three minutes), I touched other areas and my mouth came into contact with those areas (my mouth was uninjured, but my gums bled when brushing my teeth).
I am still concerned, so I went to the hospital for a blood test, which confirmed negative results.
Additionally, within 72 hours, I took Post-Exposure Prophylaxis (PEP) medication as prescribed, which is a film-coated tablet.
The doctor instructed me to take it after breakfast at 8 AM, one tablet per day.
However, due to a busy work schedule, I was unable to take the medication at the prescribed time for about a week; sometimes I took it at noon or in the afternoon, and a couple of times at 6 PM, but I did take one tablet each day.
Will this affect the efficacy of the medication? Also, during the one-month course of taking the PEP medication, is it safe to take other over-the-counter medications, such as anti-inflammatory pain relievers or headache medication?

Lin, 20~29 year old female. Ask Date: 2021/04/10

Dr. Du Shixi reply Urology


Hello: 1) Based on your description, taking the medication outside of the prescribed schedule does not have a significant impact, and regarding the over-the-counter medication, it should also not have a major effect.
2) If you still have concerns, you may consult the prescribing physician.
Wishing you good health.

Reply Date: 2021/04/10

More Info


When it comes to HIV medication, adherence to the prescribed dosing schedule is crucial for maintaining the effectiveness of the treatment. In your case, you mentioned that you were prescribed a medication (likely a pre-exposure prophylaxis or PrEP) to take once daily after breakfast, but due to your busy schedule, you occasionally took the medication at varying times throughout the day. This inconsistency in dosing can potentially impact the effectiveness of the medication, although the degree of impact can vary based on the specific drug and the duration of the delay.

HIV medications, particularly those used for PrEP, are designed to maintain a certain level of the drug in your bloodstream to effectively prevent the virus from establishing an infection. If doses are missed or taken irregularly, the drug levels may drop below the therapeutic threshold, which can reduce its effectiveness. Studies have shown that consistent daily dosing is associated with a significantly lower risk of HIV infection. Therefore, while taking the medication daily is a positive step, the timing and consistency of those doses are equally important.

In your case, since you were taking the medication daily, even if the timing varied, you may still have some level of protection. However, it is essential to strive for consistency in taking your medication at the same time each day. If you find it challenging to adhere to the schedule, consider setting reminders or using a pill organizer to help manage your doses.

Regarding the use of other medications, such as anti-inflammatory or pain relief medications, it is generally safe to take these alongside your HIV medication, but there are a few considerations. First, always check with your healthcare provider or pharmacist before combining medications to ensure there are no potential interactions. Some over-the-counter medications can interact with HIV medications, affecting their efficacy or increasing the risk of side effects. For example, certain non-steroidal anti-inflammatory drugs (NSAIDs) can affect kidney function, which is particularly important if you are taking medications that also impact renal health.

Moreover, if you are experiencing any side effects from your HIV medication or if you have specific health concerns, it is crucial to discuss these with your healthcare provider. They can provide personalized advice based on your overall health status and the specific medications you are taking.

In summary, while occasional delays in taking your HIV medication may not completely negate its effectiveness, consistent adherence to the prescribed schedule is vital for optimal protection against HIV. Additionally, consult with your healthcare provider regarding any other medications you wish to take to ensure they are safe to use in conjunction with your HIV treatment. Regular follow-ups and open communication with your healthcare team will help you manage your health effectively and address any concerns you may have.

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