Acyclovir is a well-known antiviral used for herpes viruses: cold sores (HSV-1), genital herpes (HSV-2), chickenpox and shingles (varicella zoster). It won’t cure these viruses, but it reduces symptom length, eases pain, and helps outbreaks clear faster when you start treatment early.
It comes as a cream, oral tablets or liquid, and an IV form for serious cases in hospital. Which form you need depends on how bad the infection is and where it’s located. For example, topical cream helps mild cold sores, while oral pills treat genital herpes or shingles.
Start as soon as you notice symptoms. For herpes, beginning treatment at the first tingling or redness gives the best results. Adults commonly take oral acyclovir several times per day for a few days to a couple of weeks depending on the infection. Shingles often needs higher doses and a longer course than a simple cold sore.
Don’t skip doses and finish the prescribed course. If you stop early because you feel better, the virus can reactivate sooner. If you miss a dose, take it when you remember unless it’s almost time for the next one — don’t double up.
Most people tolerate acyclovir well. Common side effects are nausea, headache and tiredness. Some people may get stomach upset or mild skin reactions. Rare but serious problems include kidney issues, especially if you’re dehydrated or already have kidney disease. Drink plenty of water while taking the drug and tell your doctor if you have kidney problems.
Older adults and people with low kidney function often need lower doses. If you’re pregnant, breastfeeding, or on multiple medicines, check with your clinician—some drugs affect acyclovir levels and vice versa. If you notice severe confusion, fast swelling, or trouble urinating, seek medical help right away.
Want to buy acyclovir online? It should come with a valid prescription. Use licensed pharmacies that list a physical address, verified pharmacist contact, and clear return/refund policies. Avoid sellers that promise miracle cures or extremely low prices with no prescription. If a site looks shady or won’t verify a prescription, walk away.
If you get frequent outbreaks, talk to your doctor about suppressive therapy options and safe long-term plans. For one-off or severe cases, follow the exact instructions from your healthcare provider. When in doubt, ask—your pharmacist can explain dosing, side effects, and interactions in plain language.
Acyclovir is a practical tool for managing herpes viruses when used correctly. Use it early, stay hydrated, follow dosing guidance, and buy from reputable sources. And always check with a clinician if anything feels off.
