Serotonin syndrome symptoms usually occur within several hours of taking a new drug or increasing the dose of a drug you're already taking. Signs and symptoms include:  Agitation or restlessness Insomnia Confusion Rapid heart rate and high blood pressure Dilated pupils Loss of muscle coordination or twitching muscles High blood pressure Muscle rigidity Heavy sweating Diarrhea Headache Shivering Goose bumps  Severe serotonin syndrome can be life-threatening. Signs include:  High fever Tremor Seizures Irregular heartbeat Unconsciousness 
serotonin syndrome symptoms occur hours taking new drug increasing dose drug you're taking  signs symptoms include:  agitation restlessness insomnia confusion rapid heart rate high blood pressure dilated pupils loss muscle coordination twitching muscles high blood pressure muscle rigidity heavy sweating diarrhea headache shivering goose bumps  severe serotonin syndrome can life-threatening  signs include:  high fever tremor seizures irregular heartbeat unconsciousness 
serotonin syndrome