Acyclovir is an antiviral medication used to treat herpes infections. It works by preventing the virus from multiplying and spreading. Like any medication, acyclovir can cause side effects. The duration of acyclovir side effects can vary depending on the individual and the severity of the side effect.

According to Drug Patent Watch [1], common side effects of acyclovir include nausea, vomiting, diarrhea, headache, and dizziness. These side effects usually go away on their own within a few days.

However, more serious side effects can occur, such as allergic reactions, confusion, hallucinations, and seizures. If these side effects occur, it is important to seek medical attention immediately.

Drugs.com [2] notes that some side effects of acyclovir can be long-lasting. For example, hair loss has been reported in some patients and can persist for several months after stopping the medication. Other long-lasting side effects include skin rash, itching, and hives.

SingleCare [3] also lists long-lasting side effects of acyclovir, including kidney damage and liver damage. These side effects are rare but can be serious. It is important to monitor kidney and liver function while taking acyclovir.

In summary, the duration of acyclovir side effects can vary depending on the individual and the severity of the side effect. Common side effects usually go away within a few days, but more serious side effects can be long-lasting. If you experience any side effects while taking acyclovir, it is important to speak with your healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ACYCLOVIR
[2] https://www.drugs.com/sfx/acyclovir-side-effects.html
[3] https://www.singlecare.com/blog/acyclovir-side-effects/