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Acyclovir / Aciclovir

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Molecule Description

Acyclovir (also Aciclovir) is an antiviral medicine that belongs to a class of medicines called nucleoside analogues. It’s commonly used to treat viral infections caused by the herpes virus family, including cold sores (herpes labialis), genital herpes, shingles (herpes zoster), and chickenpox (varicella). Acyclovir helps control outbreaks and reduce the severity and duration of symptoms, though it does not completely cure the infection or prevent it from spreading to others. Acyclovir works by blocking the virus’s ability to multiply inside your body. After being absorbed, it is converted into an active form inside infected cells, where it interferes with the virus’s DNA replication. In simple terms, it “stops the virus from copying itself,” allowing your immune system to control the infection more effectively and helping sores heal faster. Common side effects include nausea, headache, dizziness, tiredness, and mild stomach upset. Avoid alcohol while taking Acyclovir, as it may increase dizziness or dehydration. Drink plenty of fluids to protect your kidneys, especially if you’re on a higher dose or using Acyclovir long-term. If you have kidney disease, neurological conditions, or are elderly, your doctor may adjust your dose. Avoid driving or operating machinery if you feel dizzy or sleepy after taking it.

Uses

Acyclovir is used to treat viral infections like genital herpes, herpes simplex, neonatal herpes, shingles, and chickenpox.

Contraindications

When should one not use Acyclovir / Aciclovir

  • Allergic to the medicine
  • Sudden onset of kidney disease (Acute renal failure)
  • Dehydration

Side effects

Common side effects of this drug are:

  • Nausea
  • Vomiting
  • Diarrhea
  • Headache
  • Giddiness
  • Tiredness
  • Muscle or joint pains
  • Visual disturbances

Precautions and Warnings

Pregnancy

Pregnancy

The drug can be used in pregnancy only if recommended by a physician.

Breast Feeding

Breast Feeding

It is passed onto breast milk but less likely to cause any harmful effects. Hence should be used with caution.

Driving

Driving

It is probably safe while driving. It does not usually affect your ability to drive.

Alcohol

Alcohol

No information is available on interactions of Acyclovir when taken with alcohol, consult your doctor or pharmacist for further details.

Mode of Action

How Does It Work?

It inhibits and inactivates the genetic material of the virus without affecting the normal cellular processes.

Interactions

Interactions with other medicines

  • Medications used to treat bacterial or fungal infections including Amphotericin B, Amikacin, Gentamycin, Kanamycin, and Tobramycin
  • Over the counter pain reliever
  • Medicines used to treat HIV, such as Zidovudine.

Interactions with food items

Do not use this medicine at or around the time of meals. Using tobacco and alcohol, along with this drug, may cause interactions.

Dietary Restrictions

No information is available on dietary restrictions while you are taking Acyclovir, consult your doctor or pharmacist for further details.

Dosage

Overdose

Kidney damage, permanent nerve damage (hence adequate hydration is essential while on Acyclovir).

Missed a Dose

Take the incomprehensible dose as shortly as you bear in mind. If it is almost time for your next dose, skip the missed dose, and take medicine at the next regular scheduled time.

Frequently Asked Questions (FAQs)

It is likely to help treat herpes infection. In the case of Acyclovir-resistant strains, treatment with other medicines may be mandatory.

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take two doses at the same time to make up for a missed one. Maintaining consistent dosing is important for viral control.

Yes, Acyclovir is often prescribed long-term (e.g., for 6–12 months or longer) to prevent frequent or severe outbreaks of genital herpes. Your doctor will monitor you periodically to ensure the continued safety and effectiveness of this suppressive therapy.

Stay well-hydrated by drinking plenty of water throughout the day to protect your kidneys. If you have kidney disease, your doctor may adjust the dose. Also, know that Acyclovir does not prevent the spread of herpes viruses, so use safe sex practices (condoms) even when taking the medication.

Acyclovir is an antiviral medicine used to treat infections caused by the herpes family of viruses, including cold sores (Herpes Simplex Virus), genital herpes, and shingles or chickenpox (Varicella-Zoster Virus). It works by slowing the growth and spread of the virus, helping your body fight the infection.

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