Treats herpes virus infections, including shingles (herpes zoster) and genital herpes (herpes simplex). Also treats chickenpox. This medicine will not cure herpes, but may prevent a breakout of herpes sores or blisters.
You should not use this medicine if you have had an allergic reaction to acyclovir or to similar medicines such as famciclovir (Famvir®), ganciclovir (Cytovene®, Vitrasert®), valacyclovir (Valtrex®), or valganciclovir (Valcyte?).
Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to.
Take this medicine at the first sign of a herpes breakout, or as soon as possible after you are diagnosed with herpes zoster. The medicine may not work if you wait longer than 3 days to start using it.
You may take this medicine with or without food.
Drink extra fluids so you will pass more urine while you are using this medicine. This will keep your kidneys working well and help prevent kidney problems.
Shake the oral liquid thoroughly before each use. Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
If a dose is missed:
If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any leftover medicine after you have finished your treatment. You will also need to throw away old medicine after the expiration date has passed.
Keep all medicine away from children and never share your medicine with anyone.
Make sure your doctor knows if you are pregnant or breast feeding. Tell your doctor if you have kidney disease or a weak immune system. Some things that cause a weak immune system are cancer chemotherapy, HIV/AIDS, recent infection, or recent bone marrow or kidney transplant.
Acyclovir will not stop the spread of herpes during sex. Avoid having sex while you have herpes sores.
Even if you have no signs of a herpes infection, it is still possible to spread the virus to others during sex. Talk with your doctor about ways to keep from spreading the virus.
If your symptoms do not improve or if they get worse, call your doctor.