"Jan. 5, 2012 -- People with genital herpes can still infect their sex partners -- even if they are taking anti-herpes drugs that prevent herpes outbreaks.
Even when they don't have an active herpes outbreak, people who carry genital h"...
Short-Term Administration: The most frequent adverse events reported during clinical trials of treatment of genital herpes with ZOVIRAX (acyclovir) 200 mg administered orally 5 times daily every 4 hours for 10 days were nausea and/or vomiting in 8 of 298 patient treatments (2.7%). Nausea and/or vomiting occurred in 2 of 287 (0.7%) patients who received placebo.
Long-Term Administration: The most frequent adverse events reported in a clinical trial for the prevention of recurrences with continuous administration of 400 mg (two 200-mg capsules) 2 times daily for 1 year in 586 patients treated with ZOVIRAX (acyclovir) were nausea (4.8%) and diarrhea (2.4%). The 589 control patients receiving intermittent treatment of recurrences with ZOVIRAX (acyclovir) for 1 year reported diarrhea (2.7%), nausea (2.4%), and headache (2.2%).
The most frequent adverse event reported during 3 clinical trials of treatment of herpes zoster (shingles) with 800 mg of oral ZOVIRAX (acyclovir) 5 times daily for 7 to 10 days in 323 patients was malaise (11.5%). The 323 placebo recipients reported malaise (11.1%).
The most frequent adverse event reported during 3 clinical trials of treatment of chickenpox with oral ZOVIRAX (acyclovir) at doses of 10 to 20 mg/kg 4 times daily for 5 to 7 days or 800 mg 4 times daily for 5 days in 495 patients was diarrhea (3.2%). The 498 patients receiving placebo reported diarrhea (2.2%).
Observed During Clinical Practice: In addition to adverse events reported from clinical trials, the following events have been identified during post-approval use of ZOVIRAX (acyclovir) . Because they are reported voluntarily from a population of unknown size, estimates of frequency cannot be made. These events have been chosen for inclusion due to either their seriousness, frequency of reporting, potential causal connection to ZOVIRAX (acyclovir) , or a combination of these factors.
Nervous: Aggressive behavior, agitation, ataxia, coma, confusion, decreased consciousness, delirium, dizziness, dysarthria, encephalopathy, hallucinations, paresthesia, psychosis, seizure, somnolence, tremors. These symptoms may be marked, particularly in older adults or in patients with renal impairment (see PRECAUTIONS).
Digestive: Diarrhea, gastrointestinal distress, nausea.
Special Senses: Visual abnormalities
Read the Zovirax (acyclovir) Side Effects Center for a complete guide to possible side effects
See CLINICAL PHARMACOLOGY: Pharmacokinetics.
Last reviewed on RxList: 11/8/2010
This monograph has been modified to include the generic and brand name in many instances.
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