It is an antidote for heparin.
It is obtained from fish sperm.
It is strongly basic macromolecule due to the presence of more amount of arginine.
In this positive charge of protamine forms complex with negative charge of heparin (a polyanionic macromolecule) neutralizing its activity.
It is administered IV after proper dilution with physiological salt solution. Its duration of affect is 2 hours.
Hypersensitivity reactions may develop. On rapid injection, flushing, dyspnea, hypotension, and bradycardia may be caused.