Skeletal formula of propranolol, the first clinically successful beta blocker
Dichloroisoprenaline, the first beta blocker

He went to work for ICI Pharmaceuticals in 1958 and, while there, developed propranolol, a beta blocker used for the treatment of heart disease.

- James Black (pharmacologist)

In 1964, James Black synthesized the first clinically significant beta blockers—propranolol and pronethalol; it revolutionized the medical management of angina pectoris and is considered by many to be one of the most important contributions to clinical medicine and pharmacology of the 20th century.

- Beta blocker
Skeletal formula of propranolol, the first clinically successful beta blocker

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An 80 mg capsule of extended-release propranolol

Propranolol

An 80 mg capsule of extended-release propranolol
A mixture of 20 mg and 10 mg propranolol tablets
Propranolol

Propranolol, sold under the brand name Inderal among others, is a medication of the beta blocker class.

Scottish scientist James W. Black developed propranolol in the 1960s.