<unk>  is a medication primarily used as a decongestant, to dilate the pupil, to increase blood pressure, and to relieve hemorrhoids. When taken orally as a decongestant, it relieves nasal congestion due to colds and hay fever. It can be taken by mouth, as a nasal spray, given by injection into a vein or muscle, or applied to the skin. Common side effects when taken by mouth or injected include nausea, headache, and anxiety. Use on hemorrhoids is generally well tolerated. Severe side effects may include a slow heart rate, intestinal ischemia, chest pain, kidney failure, and tissue death at the site of injection. It is unclear if use during pregnancy or breastfeeding is safe.<unk>  is a selective α1-adrenergic receptor activator which results in the constriction of both arteries and veins.<unk>  was patented in 1927 and came into medical use in 1938. It is available as a generic medication. Unlike pseudoephedrine, abuse of<unk>  is very uncommon.
Phenylephrine
Prazosin
Terazosin
Acebutolol
Doxazosin
Oxymetazoline
Metergoline
Clonidine