Viagra 100 mg (sildenafil citrate) can sometimes cause headaches, flushing, upset stomachs, and stuffy noses. These side effects are usually mild and go away on their own after a few hours. However, if these side effects persist or are bothersome, there are some things that can be done to manage them:
Stay hydrated. Drinking plenty of water can help alleviate some of the side...
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