Contraindications for Acyclovir

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Before taking Zovirax (Acyclovir), tell your doctor or pharmacist if you are allergic to it; or to valacyclovir; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

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Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems, conditions related to a weakened immune system (such as HIV disease, bone marrow transplant, kidney transplant).

This drug may rarely make you dizzy or drowsy. Alcohol or marijuana can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Do not have certain immunizations/vaccinations (such as vaccines against the varicella virus) without the consent of your doctor.

Older adults may be more sensitive to the side effects of the drug, especially kidney problems (change in the amount of urine, back/side pain), dizziness, drowsiness, and mental/mood changes (such as confusion, hallucinations, loss of consciousness).

Acyclovir does not protect against the spread of genital herpes. To lower the chance of giving herpes to your partner, do not have sexual contact during an outbreak or if you have symptoms. You can spread genital herpes even if you do not have symptoms. Therefore, always use an effective barrier method (latex or polyurethane condoms/dental dams) during all sexual activity. Consult your doctor or pharmacist for more details.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

This medication passes into breast milk. However, this drug is unlikely to harm a nursing infant. Consult your doctor before breast-feeding.


Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor’s approval.

Some products that may interact with this drug include: other drugs that may cause kidney problems (including nonsteroidal anti-inflammatory drugs-NSAIDs such as ibuprofen, naproxen).


Isabel Isabel avatar

I was tortured by herpes since the childhood and have tried lots of various meds. For example, before buying Zovirax, I used Abreva, but meds like that are much more expensive and have a tiny tube size. I don’t want to overpay for these medicines because the herpes appears quite often. So I decided to buy a tube of Zovirax. It’s not expensive at all! There are both small and large tubes on sale, as well as tablets.
If you use this drug immediately, as soon as you feel the itch, then the herpes passes very quickly, if the blisters begin to appear, then the disease passes somewhere in 5 days. For best results, I advise you to use it together with the pills.

Paige Paige avatar

I learned about Zovirax thanks to reviews on the Internet. Since the cost of the drug is VERY low, I did not hesitate to buy it and bought it in the nearest pharmacy. Zovirax is an antiviral agent, I needed this drug, first of all, to fight the herpes virus.
This misfortune happens to me infrequently, but, as always happens, at the most inopportune moment, before some holiday or responsible event.
With the very first symptoms of the onset of herpes on the lips, I urgently took Zovirax and the result was just excellent! The swollen on my lips have never reached maximum as it was before!
But my husband has recently got herpes on the nostril. He rarely gets sick, but now this problem has become very difficult for him recently! It looks very unattractive! Not any better than on your lips!
I, naturally, advised him to try Zovirax. Now he is actively using Zovirax and it is helping! Therefore, I recommend this med to treat herpes, especially at a low price!