Potential Side Effects
Common side effects include stomach upset, nausea, vomiting and diarrhea. Less common but serious side effects include esophagitis, increased head pressure (persistent headaches and blurred vision) in these cases you should stop taking the prophylaxis immediately seek medical consultation. Other rare side effects may affect the blood and liver and manifest as neurological/psychological symptoms.
Sun Exposure
Antibiotics commonly used for STI prophylaxis can increase sun sensitivity. Protect your skin with sunscreen or by wearing protective clothing when outdoors.
Generally, it is advisable to eat something before taking antibiotics commonly used for STI prophylaxis to avoid feeling nauseous, as mentioned in the section How are antibiotics for bacterial STI prophylaxis typically used as PEP.