Methyl Parathion (MP)
Parathion methyl is an organophosphate pesticide and insecticide, possessing a organothiophosphate group. It is structurally very similar to parathion-ethyl. Parathion methyl is used as an insecticide on crops, including cotton. Since it is an acetylcholinesterase inhibitor, symptoms of exposure to parathion methyl include irritated eyes and skin, nausea and vomiting, abdominal pain, diarrhea, salivation, feeling weak and tired, headache, runny nose, tightness in the chest, blurry vision, pupil constriction, irregular heartbeat, muscle twitches (fasciculation), and difficulty breathing.