<unk>  was once a mainstay for hypertension resistant to other agents, and was often used safely during pregnancy, but it is no longer used in the US due to lack of availability. It is still licensed in some countries, e.g., UK, for the rapid control of blood pressure in a hypertensive emergency. Intravenous nerve block (Bier block) using<unk>  has been used to treat chronic pain caused by complex regional pain syndrome.
Guanethidine
Bendiocarb
Famprofazone
Mesocarb
Gadoteric acid
Cafaminol
Astemizole
Piroxicam