If you have already had bad experience with medications, then you probably know that there are very few drugs that does not have any side effect. Most of the drugs could cause some negative effects, after a long period of use. Famvir is no different - headache,
diarrhea, stomach problems (including vomiting),
sleepiness, dizziness etc. If any of these occurs, you must consider talking to your doctor, and even changing the therapy.
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