Question: what over the counter medicine for a sinus infection?
Answer: Try a pain reliever such as acetaminophen or ibuprofen to relieve facial pain and headache.
Use a nasal spray, gel, or drops to help a stuffy nose. ... 
Try an oral decongestant for a stuffy nose or head. ... 
Try using a medicine that thins mucus and improves sinus drainage (mucolytic).