What happens if I take two PrEP pills in one day? For most people, accidentally taking two oral PrEP pills in one day causes no serious harm, but it can increase short-term side effects like nausea, stomach cramping, diarrhea, headache, or dizziness. The medications are processed by kidneys, so taking extra occasionally is usually tolerated, but regularly doubling up can raise risk of kidney strain and bone density changes over time, especially with tenofovir disoproxil fumarate. Do not make a habit of doubling doses to make up for multiple missed days. The recommended approach for a missed dose is to take it when you remember, then resume your normal schedule next day. If it is almost time for your next dose, skip the missed one. The exception is the 2-1-1 on-demand schedule for anal sex, where taking two pills together 2 to 24 hours before sex is intentional and studied for that specific population. If you took two pills and feel unwell, have kidney disease, take other nephrotoxic drugs, or are worried about an overdose, contact your healthcare provider, pharmacist, or poison control promptly for guidance.
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