Orciprenaline
Orciprenaline, also known as metaproterenol, is a bronchodilator used in the treatment of asthma. Orciprenaline is a moderately selective β2 adrenergic receptor agonist that stimulates receptors of the smooth muscle in the lungs, uterus, and vasculature supplying skeletal muscle, with minimal or no effect on α adrenergic receptors. The pharmacologic effects of β adrenergic agonist drugs, such as orciprenaline, are at least in part attributable to stimulation through β adrenergic receptors of intracellular adenylyl cyclase, the enzyme which catalyzes the conversion of ATP to cAMP. Increased cAMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from many cells, especially from mast cells.

Possible side effects
tremor
nervousness
dizziness
weakness
headache
nausea
tachycardiaRare side effects that could be life-threateningincreased difficulty breathing
rapid or increased heart rate
irregular heartbeat
chest pain or discomfort

Brand names
Alupent
Metaprel
Orcibest


== References ==