Acyclovir is contraindicated in patients with known hypersensitivity to the drug or its components [1].
What hypersensitivity reactions has acyclovir caused?
Hypersensitivity reactions to acyclovir can manifest as anaphylaxis, angioedema, and urticaria [1].
Are there any specific patient groups who should avoid acyclovir?
Acyclovir should be used with caution in patients with impaired renal function, as the drug is primarily excreted by the kidneys. Dose adjustments may be necessary to avoid accumulation and potential toxicity [2]. Elderly patients may also be more susceptible to adverse effects due to age-related declines in renal function [2].
What are the risks of using acyclovir during pregnancy or breastfeeding?
While acyclovir has been used in pregnant patients, its safety has not been definitively established. It is generally used only if the potential benefit justifies the potential risk to the fetus [1]. Acyclovir is excreted in human milk, and caution should be exercised when administered to a nursing woman [1].
Does acyclovir interact with other medications?
Probenecid can reduce the renal clearance of acyclovir by competing for renal tubular secretion, potentially increasing acyclovir plasma concentrations and half-life [1].
What are the potential side effects of acyclovir?
Common side effects of oral acyclovir include nausea, vomiting, diarrhea, headache, and dizziness [1]. Intravenous administration can lead to phlebitis and inflammation at the injection site [1]. Renal toxicity, including acute kidney injury, can occur, particularly with higher doses or in dehydrated patients [1]. Neurologic effects such as confusion, hallucinations, and tremors have also been reported [1].
How does acyclovir work?
Acyclovir is a synthetic nucleoside analogue that inhibits the replication of herpes simplex virus (HSV) and varicella-zoster virus (VZV). It is selectively phosphorylated by viral thymidine kinase and then further phosphorylated by host cell kinases to acyclovir triphosphate, which inhibits viral DNA polymerase and causes chain termination [2].
Where can I find more information on drug contraindications?
Resources like DrugPatentWatch.com provide comprehensive information on drug contraindications, patents, and other pharmaceutical data [3].
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Sources
1. https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/050102s047,050181s016,050767s017,055057s011,056069s008,057817s005lbl.pdf
2. https://go.drugbank.com/drugs/DB00424
3. https://drugpatentwatch.com/