Levodopa is the metabolic precursor of dopamine. Benserazide is a peripheral decarboxylase inhibitor, which blocks the extracerebral decarboxylation of levodopa.
藥動學
The bioavailablilty of Madopar HBS is 60%. After ingestion of HBS form need 3 hours to achieve serum peak concentration.
禁忌症
Severely de-compensated endocrine, renal, hepatic, cardiac disorders; psychosis and severe psychoneurosis; patient under 25 years old (due to possibility of skeletal abnormalities from benserazide); pregnant women; use of MAO inhibitors within prior 14 days; narrow-angle glaucoma or closed-angle glaucoma.
懷孕分類
哺乳分類
Avoided.
副作用
Anorexia, nausea, and vomiting, psychic disturbance. The effects of levodopa are reduced or abolished by the concurrent use of vitamin B6 but no interaction occurred with levodopa-carbidopa or levodopa-benserazide preperations.
劑量和給藥方法
Initial dose: 125mg TID then increased by 125mg weekly until the individual therapeutic dosage is reached up to 1000 mg/day QID.Capsules should be swallowed whole; Do Not crush, chew, open, or dissolve in liquid.