PRECAUTIONS: Before using acyclovir, tell your doctor or pharmacist if you are allergic to it; or to valacyclovir; or if you have any other allergies. Before using this medication, tell your doctor or pharmacist your medical history. Tell your doctor if you are pregnant before using this medication. Discuss the risks and benefits with your doctor. It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding. Avoid breastfeeding if you have herpes sores on or near your breast.

DRUG INTERACTIONS: Your healthcare professionals (e.g., doctor or pharmacist) may already be aware of any possible drug interactions and may be monitoring you for it. Do not start, stop or change the dosage of any medicine before checking with them first. Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. This medicine may be harmful if swallowed.

NOTES: When this mediation is used to treat genital herpes, it is best to avoid sexual activity while signs and symptoms of genital herpes are present to prevent infecting your partner. Do not share this medication with others. Wear loose-fitting clothing if you have genital herpes sores to keep from irritating them.

MISSED DOSE: If you miss a dose, use it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

STORAGE: Store the US product at room temperature at or below 77 degrees F (25 degrees C) away from moisture. Brief storage between 59-86 degrees F (15-30 degrees C) is permitted. Do not store in the bathroom. Keep all medicines away from children and pets.