Acyclovir

You don't need to get worried if you have some of the following mild side effects of this medicine: dizziness, diarrhea, upset stomach, tiredness, agitation, vomiting and vision changes. Discuss all these side effects with your doctor, especially if you have to take this drug for a long period of time. If you have a reason to believe you have taken too much of this medicine and experience decreased urination, seizures, agitation, extreme tiredness, swelling of the hands and feet, and loss of consciousness, seek emergency medical assistance to prevent the situation from getting worse.