Pyridostigmine is a medication used to treat myasthenia gravis. It is also used together with atropine to end the effects of neuromuscular blocking medication of the non-depolarizing type. It is typically given by mouth but can also be used by injection. The effects generally begin within 45 minutes and last up to 6 hours.Common side effects include nausea, diarrhea, frequent urination, and abdominal pain. More severe side effects include low blood pressure, weakness, and allergic reactions. It is unclear if use in pregnancy is safe for the baby. Pyridostigmine is an acetylcholinesterase inhibitor in the cholinergic family of medications. It works by blocking the action of acetylcholinesterase and therefore increases the levels of acetylcholine.Pyridostigmine was patented in 1945 and came into medical use in 1955. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. Pyridostigmine is available as a generic medication. The wholesale cost in the developing world is about US$7.17–65.93 a month. In the United States it costs about US$25–50 per month.

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