Acyclovir is an antiviral drug that decreases the severity and length of these outbreaks. It helps the sores to heal faster, keeps new sores from forming, and decreases pain or itching. It also helps reduce how long pain remains after the sores heal. However, it is not a cure for these infections for the viruses that cause these infections continue to live in the body even between outbreaks. Acyclovir also decreases the risk of the virus spreading to other parts of the body for people who have weak immune system.

Infections, cause by certain types of viruses are treated by Acyclovir. It is used to help reduce the number of future episodes in people with frequent outbreaks like genital herpes. Acyclovir also used to treat cold sores around the mouth (caused by herpes simplex), shingles (caused by herpes zoster), and chickenpox.

This drug may make you dizzy or drowsy but it is rare. To be safe, do not drive, use machinery, or do any activity that requires alertness. Also, limit alcoholic beverages.

Side effects include nausea, diarrhea, headache, or vomiting. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Although it is rare, some develop a very serious allergic reaction to this drug. Seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.


Tell your doctor or pharmacist if you are allergic to it; or to valacyclovir; or if you have any other allergies before taking the drug. This product may contain inactive ingredients that can cause allergic reactions or other problems. Talk to your pharmacist for more details.



Other drugs that may cause kidney problems (including nonsteroidal anti-inflammatory drugs-NSAIDs such as ibuprofen, naproxen) may interact with Acyclovir.

Acyclovir is very similar to valacyclovir. Do not use medications containing valacyclovir while using acyclovir.

Call the emergency hotline if you suspect someone has overdosed. Serious symptoms such as passing out or trouble breathing may occur. Lesser symptoms like change in the amount of urine, extreme tiredness, agitation, loss of consciousness, seizures may include.


Available Brands:

  • Herpex
  • Lovir
  • Virest
  • Zovirax
  • Zylovir

Related Articles

Vaccine, DTP

DTP vaccine (Diphtheria and Tetanus toxoids and Pertussis adsorbed vaccine) is a combination vaccine used to induce specific antibody production, thus promoting immunity [...]


Teicoplanin is a glycopeptide antibiotic drug that inhibits the growth of susceptible organisms by disrupting cell-wall synthesis. It binds to D-alanyl-D-alanine residues resulting to peptidoglycan synthesis blockage. Use this [...]


Secukinumab is a human monoclonal antibody, Immunoglobulin G1/K that binds selectively to interleukin-17A (IL-17A), a natural cytokine affecting normal inflammatory and immune responses. It inhibits the release [...]