How Acyclovir Works
 
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Role of Acyclovir
Acyclovir is the generic name of the drug Zovirax. It is an antiviral prescription medicine used to treat shingles, chickenpox, genital herpes, herpes simplex and herpes zoster. Acyclovir can also help those with HIV live longer by preventing herpes simplex from occurring. Additionally used to treat a viral infection called lenkoplakia that occurs on the tongue, this drug is also used to for herpes virus infections in newborn children. However it is important to remember here that Acyclovir does not cure herpes; it only helps to relieve the pain and heal sores faster.

Acyclovir works against viruses like HSV-1 (Herpes Simplex-1), HSV-2 (Herpes Simplex-2), and VZV (Herpes Zoster). It is considered the drug of choice in the treatment of mucosal or cutaneous HSV infections in immuno-compromised patients. It is also used to treat severe episodes of genital herpes infections, for herpes encephalitis; for neonatal herpes infections and for the treatment of varicella-zoster infections. This drug works by thwarting the enzymes the virus needs for replication of DNA in cells, thus preventing the virus from multiplying and growing.

Acyclovir should be taken with food and with a full glass of water. It is important that you take this drug exactly as prescribed by your doctor. Do exceed it use or discontinue its use without informing your health care practitioner

Side effects of Acyclovir
The side effects of this drug are mild and usually go away during treatment. They include;
- nausea,
- vomiting,
- diarrhea, and
- headaches
If these symptoms continue or become troublesome, contact your doctor. People who have used this drug on a long term basis have reported hair loss as a side effect as well.
Some other rare side effects of this drug include;
- dizziness,
- fatigue,
- skin rash,
- anorexia,
- leg pain, and
- sore throat

The side effects of nausea and vomiting can be reduced if Acyclovir is taken with meals.
Some drugs helpful in reducing nausea include Compazine, Reglan, and Phenergan. Aspirin usually helps with symptoms of headaches.

Precautions
It is important that you inform your doctor of any medical conditions such as, allergies to foods, sulfites or preservatives. Dehydration or kidney disease can increase blood levels of acyclovir, which in turn increase the chances of side effects occurring. If you are on any of the following drugs notify your doctor;
- any medicine for infection
- Carmustine (BiCNU)
- Cisplatin (Platinol)
- Combination pain medicine containing acetaminophen and aspirin (Excedrin)
- Cyclosporine (Sandimmune)
- Deferoxamine (Desferal)
- Ganciclovir
- Gold salts
- Inflammation or pain medication
- Lithium (Lithane)
- Methotrexate (Mexate)
- Any narcotic
- Nephrotoxic agents
- Penicillamine (Cuprimine)
- Plicamycin (Mithracin)
- Probenecid
- Streptozocin (Zanosar)
- Tiopronin (Thiola)
- Valacyclovir

Using any of these drugs with acyclovir may increase the chance for side effects, especially in those people with kidney disease.

If you get pregnant or plan on becoming pregnant, inform your doctor about your medication. Acyclovir is excreted in breast milk, so do not use this drug if you are breast feeding.

Do not miss or skip any doses of this drug. If you do miss a dose, take it as soon as possible. But if it is almost time for your next dose, skip the missed dose. Never take a double or extra dose of this drug.