What is the dosage of selegiline/imidopyr?

The usage and dosage of Selegiline/imidopir(Selegiline) for the treatment of Parkinson's disease have relatively clear clinical standards. The common recommended starting dose is 5 mg taken orally once in the morning to reduce possible insomnia in patients at night. According to the progression of the disease and patient tolerance, the dose can be gradually increased to 10 mg daily, usually divided into 5 mg in the morning and noon, or 10 mg taken once in the morning. Fractionated administration helps maintain a stable concentration of the drug in the body, resulting in longer-lasting effects.

When combined with levodopa, selegiline has a synergistic effect and can significantly enhance the effects of dopaminergic therapy. Since selegiline reduces the metabolism of dopamine and prolongs the activity time of levodopa, clinically it is often necessary to appropriately reduce the dose of levodopa according to the situation to avoid dose-related adverse reactions, such as dyskinesia, nausea, or blood pressure fluctuations. Doctors usually adjust the medication regimen based on the patient's specific condition, so it is important to strictly follow the doctor's instructions.

It needs to be emphasized that, as aMAO-B inhibitor, selegiline mainly inhibits type B enzymes at conventional doses and has little effect on tyramine in the diet. Therefore, it will not cause a severe "cheese reaction" like traditional non-selective monoamine oxidase inhibitors. However, if used in high doses over a long period of time, selectivity may be reduced and there is still a risk of interaction. Therefore, patients should be cautious to avoid taking certain antidepressants or sympathomimetic drugs in combination during medication to prevent drug interactions.

Clinical attention also needs to be paid to the administration schedule of selegiline. Since the metabolites of the drug may have central stimulant effects, taking the drug at night may sometimes cause insomnia or dreaminess, so it is generally recommended to take it in the morning or before noon. For older patients or patients with multiple chronic diseases, doctors will pay more attention to individualized adjustment of the starting dose to ensure safety.

Reference: https://www.drugs.com/mtm/selegiline.html