amantadiini

Amantadine is a medication with antiviral and antiparkinsonian properties. Originally developed as an antiviral drug, it is primarily used for treating and preventing infections caused by influenza A virus. The drug works by blocking the viral ion channel M2, which prevents viral uncoating and release of viral genetic material into host cells.

Beyond its antiviral applications, amantadine is also employed in the management of Parkinson's disease. It helps alleviate symptoms such as rigidity, tremors, and bradykinesia by increasing dopamine release in the brain and possibly stimulating dopamine receptors. Additionally, it is sometimes used to treat drug-induced extrapyramidal symptoms, particularly those associated with antipsychotic medications.

Common side effects include nausea, dizziness, insomnia, and livedo reticularis. More serious but less frequent adverse effects may involve central nervous system effects, such as confusion, hallucinations, or seizures. The medication is generally administered orally, with dosing adjusted based on renal function due to its excretion through the kidneys.

Amantadine's effectiveness against influenza A has been limited in recent years due to widespread resistance among circulating strains. Nevertheless, it remains a valuable therapeutic option in specific clinical scenarios, particularly for patients with Parkinson's disease who experience motor fluctuations.