Acyclovir - Uses, Side Effects, Warnings, and More

Acyclovir – Uses, Side Effects, Warnings, and More

Acyclovir – Uses, Side Effects, Warnings, and More

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The use of acyclovir as a treatment for infections caused by specific types of viruses is common. It is effective in treating cold sores around the mouth, which are caused by herpes simplex, as well as shingles, which are caused by herpes zoster.

In some cases, the outbreaks of genital herpes can also be treated with this drug. Acyclovir is prescribed to patients who experience repeated outbreaks in order to assist reduce the number of future episodes. The medication acyclovir is used to treat viral infections. On the other hand, it is not a treatment that can heal these infections.

Even when there is no symptoms present, the viruses that cause these diseases can still be found living in the body. The duration and intensity of these epidemics are both shortened by the use of acyclovir. It makes the sores heal more quickly, prevents new sores from appearing, and reduces the discomfort and itching associated with the sores.

This medicine might also assist shorten the duration of the pain that is experienced after the sores have healed. In addition, the antiviral effects of acyclovir can help people with compromised immune systems reduce the likelihood that the virus will move to other parts of the body and result in more severe illnesses.

A guide to administering Acyclovir

You should take this medication by mouth as advised by your physician, which is typically anywhere from twice to five times each day. While you are taking this medication, make sure to drink a lot of water, unless your doctor tells you to do otherwise.

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If you are taking this medication in liquid form, shake the bottle vigorously just before each time you administer a dose. Make careful use of a proper measuring spoon or equipment when you are determining the correct dosage. You should not use a regular spoon since you run the risk of not getting the right amount.

The most effective use of this medicine is when it is initiated at the earliest possible stage of an outbreak, as prescribed by your attending physician. If you put off therapy for too long, it may not be as effective.

Your current health status and how you respond to treatment will determine the appropriate dosage for you. When it comes to youngsters, the dosage is determined by weight as well.

This medication exerts its beneficial effects most effectively when the amount of drug present in the body is maintained at a steady level. Take this medication at regular intervals that are spaced out equally. Take it at the same time every day so that you don’t forget. This will assist.

Take this medication as directed until the complete dose that was recommended to you has been consumed. Without first seeing your physician, do not alter the dosage you are taking, skip any doses, or stop taking this medication before it is fully finished.

Notify your primary care physician if your issue persists or worsens.

Adverse Reactions

There is a possibility that you will experience nausea, diarrhoea, headache, or vomiting. Notify your doctor or pharmacist as soon as possible if any of these side effects continue or become worse.

Keep in mind that the reason your doctor has recommended that you take this medication is that he or she believes that the potential benefits to you outweigh the potential risks of doing so. The majority of persons who take this medicine do not report experiencing any severe adverse effects.

Notify your physician as soon as possible if you experience any serious adverse effects, including but not limited to dizziness, drowsiness, signs of kidney problems (such as a change in the amount of urine, unusual back/side pain), mental or mood changes (such as agitation, confusion, hallucinations), shaky or unsteady movement, or difficulty speaking.

There is a remote possibility that this prescription could induce a condition that is potentially fatal that affects the kidneys, blood cells, and other organs and tissues of the body. If you have illnesses that are associated with a weaker immune system, you have an increased risk of developing this ailment (such as HIV disease, bone marrow transplant, or a kidney transplant). It is imperative that you seek immediate medical attention in the event that you experience any of the following severe adverse effects: extreme fatigue, slow/fast/irregular heartbeat, easy bruising/bleeding, new fever, bloody/dark urine, severe stomach/abdominal pain, yellowing eyes/skin, sudden vision changes, loss of consciousness, or seizures.

It is unusual for this medicine to cause an extremely severe allergic reaction. However, you should seek immediate medical attention if you detect any symptoms of a significant allergic reaction, such as a rash, itching/swelling (particularly of the face/tongue/throat), extreme dizziness, or difficulty breathing. These symptoms may indicate anaphylaxis.

This list of potential adverse effects is not exhaustive in any way. Please consult your physician or pharmacist if you have any side effects that are not listed above.

In the United States, if you are experiencing any adverse effects, please consult your primary care physician. You can call the FDA at 1-800-FDA-1088 or visit their website at to report any adverse effects.

In Canada, if you are experiencing any adverse effects, please consult your primary care physician. You can call Health Canada at 1-866-234-2345 to report any adverse effects you experience.

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Inform your physician or pharmacist if you are allergic to acyclovir, valacyclovir, or if you suffer from any other types of allergies before beginning treatment with acyclovir. There is a possibility that this product contains inactive substances, which, if present, could result in allergic responses or other complications. Discuss the matter further with your pharmacist for further information.

Before beginning treatment with this drug, it is important that you discuss your medical history with your doctor or pharmacist, particularly if you have a history of renal issues or illnesses associated with an impaired immune system (such as HIV disease, bone marrow transplant, or kidney transplant).

This medication may, in very rare cases, cause you to feel lightheaded or sleepy. Drinking alcohol or smoking marijuana (also known as cannabis) can make you feel more lightheaded and sleepy. Do not get behind the wheel of a vehicle, operate any machinery, or engage in any activity that requires attentiveness until you are able to do it safely. Reduce your intake of alcoholic beverages. If you are a marijuana user, you should consult your primary care physician (cannabis).

Before undergoing surgery, it is important to discuss all of the products you use with your dentist or doctor (including prescription drugs, nonprescription drugs, and herbal products).

Without first receiving your physician’s approval, you should not have some immunizations or vaccinations (such as those that protect against the varicella virus, for example).

Elderly patients may be more sensitive to the adverse effects of the medication, particularly kidney problems (such as a change in the volume of urine and back or side pain), dizziness, drowsiness, and changes in mental and emotional state (such as confusion, hallucinations, loss of consciousness).

There is no evidence that acyclovir can prevent the transmission of genital herpes. If you want to reduce the likelihood of passing herpes on to your partner, you should avoid having sexual contact while you are experiencing an outbreak or if you are experiencing symptoms. Even if you do not have any signs of genital herpes, you might still pass it on to others. Whenever you engage in sexual activity, you should always use a reliable barrier method, such as a latex or polyurethane condom or a dental dam. Consult your doctor or pharmacist for more details.

During pregnancy, it is important to only use this drug when it is absolutely necessary. Talk to your healthcare provider about the potential drawbacks and advantages.

This drug is found in breast milk after being taken. On the other hand, it is quite improbable that this medication will cause any harm to a nursing child. Before starting to breastfeed, you should talk to your healthcare provider.


Drug interactions can alter the way in which your prescriptions work or raise the likelihood that you will have major adverse effects. This document does not contain all possible medication interactions. Maintain a list of all the goods you use, including prescription and over-the-counter medications, as well as herbal remedies, and give it to both your primary care physician and your pharmacist. Without first consulting your physician, you should never alter the dosage of any medication, stop taking any medication, or start taking any new medication.

Other medications that could potentially lead to renal problems are examples of goods that could potentially interact with this medication (including nonsteroidal anti-inflammatory drugs-NSAIDs such as ibuprofen, and naproxen).

Acyclovir and valacyclovir are very close chemical cousins. While you are using acyclovir, you should avoid taking any drugs that include valacyclovir.


Dial 911 if you suspect that someone has overdosed and they are exhibiting serious symptoms such as passing out or having problems breathing. In any other case, you should immediately contact a poison control centre. To reach the poison control centre for your area in the United States, dial 1-800-222-1222. Canada residents can call a provincial poison control centre. A change in the volume of urine, excessive weariness, agitation, loss of consciousness, and convulsions are some of the symptoms that may accompany an overdose.


It is imperative that you do not provide this medication to anyone else.

This drug has been given to you specifically for the treatment of your current condition. If you have another illness in the future, you should not use it unless your doctor tells you to.

Neglected Dose

If you forget to take a dose, you should take it as soon as you realise you forgot. If it is getting close to the time of the next dose, you should forgo the dose that you missed. Your next dose should be taken at the typical time. It is not necessary to double the dose in order to catch up.


Keep at room temperature and away from light and moisture. Store at room temperature. Keep away from the bathroom at all costs. Always make sure that children and animals are kept well away from any medications.

Unless you have been specifically told to do so, you should not flush drugs down the toilet or pour them down a drain. When it is no longer needed or has passed its expiration date, dispose of this product in the appropriate manner. Talk to your neighbourhood pharmacy or the firm that handles garbage disposal in your area.

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