Is a medicine which is used in post-operative urinary retention, prevention of ileus and intestinal atony following surgery, treatment of myasthenia gravis and treatment of neurogenic bladder.how does it work?ubretid tablets contain the active ingredient distigmine bromide, which is a type of medicine called an anticholinesterase. it works by prolonging the action of a neurotransmitter called acetylcholine.neurotransmitters are chemicals that are stored in nerve cells in the brain and nervous system. they are involved in transmitting messages between nerve cells. acetylcholine is involved in transmitting nerve messages that control many of the processes that happen automatically in the body, ie without our voluntary control. it is also involved in transmitting the nerve messages to muscles that cause them to contract.