Metyrosine

Very slightly soluble

2.48e+00 g/L

FDA approved drugs -> Active ingredient

FDA approved drugs -> Active ingredient

Warning

H302 (100%): Harmful if swallowed [Warning Acute toxicity, oral]

P261, P264, P270, P271, P301+P317, P304+P340, P319, P330, P403+P233, P405, and P501 (click each P-code to see the statement)

The GHS information provided by 1 company from 1 notification to the ECHA C&L Inventory.

Drug Induced Liver Injury Rank (DILIrank 2.0)

Metyrosine

vNo-DILI-concern

0

No match

DOI:10.1016/j.drudis.2016.02.015

C - Cardiovascular system

QC - Cardiovascular system

In patients with pheochromocytoma, who produce excessive amounts of norepinephrine and epinephrine, administration of one to four grams of metyrosine per day has reduced catecholamine biosynthesis from about 35 to 80 percent as measured by the total excretion of catecholamines and their metabolites (metanephrine and vanillylmandelic acid). The maximum biochemical effect usually occurs within two to three days, and the urinary concentration of catecholamines and their metabolites usually returns to pretreatment levels within three to four days after metyrosine is discontinued. Most patients with pheochromocytoma treated with metyrosine experience decreased frequency and severity of hypertensive attacks with their associated headache, nausea, sweating, and tachycardia. In patients who respond, blood pressure decreases progressively during the first two days of therapy with metyrosine; after withdrawal, blood pressure usually increases gradually to pretreatment values within two to three days.

Metyrosine inhibits tyrosine hydroxylase, which catalyzes the first transformation in catecholamine biosynthesis, i.e., the conversion of tyrosine to dihydroxyphenylalanine (DOPA). Because the first step is also the rate-limiting step, blockade of tyrosine hydroxylase activity results in decreased endogenous levels of catecholamines and their synthesis. This consequently, depletes the levels of the catecholamines dopamine, adrenaline and noradrenaline in the body,usually measured as decreased urinary excretion of catecholamines and their metabolites. One main end result of the catecholamine depletion is a decrease in blood presure.

DOQ0J0TPF7

METYROSINE

Established Pharmacologic Class [EPC] - Catecholamine Synthesis Inhibitor

Mechanisms of Action [MoA] - Catecholamine Synthesis Inhibitors

Metyrosine is a Catecholamine Synthesis Inhibitor. The mechanism of action of metyrosine is as a Catecholamine Synthesis Inhibitor.

METYROSINE

Well absorbed from the gastrointestinal tract.

Because the first step is also the rate-limiting step, blockade of tyrosine hydroxylase activity results in decreased endogenous levels of catecholamines, usually measured as decreased urinary excretion of catecholamines and their metabolites.