Serotonin is a chemical produced in the brain which often regulates certain moods as well as other body systems for instance, digestion. Although its production is regarded important, too much serotonin can be dangerous. This is known as serotonin syndrome when too much serotonin builds up in your body often due to the recent intake of a drug or a combination of such drugs that work with serotonin. Aside from medications, illegal drugs and dietary supplements are also known to accumulate excessive serotonin in your body.

Symptoms that indicate an onset of serotonin syndrome consist of muscle rigidity, fever, seizures, increased sweating and unconsciousness and usually occur within a few hours of taking the drug.

Some common prescribed drugs that increase serotonin levels are:

• Serotonin reuptake inhibitors (SSRIs) antidepressants
• Serotonin and norepinephrine reuptake inhibitors
• Bupropion, an antidepressant
• Tobacco-addiction medications  (Wellbutrin, Zyban)
• Monoamine oxidase inhibitors (MAOIs), antidepressants such as isocarboxazid (Marplan)
• Anti-migraine tablets
• Pain relief drugs
• Mood stabilizers(Eskalith, Lithobid)
• Illegal drugs such as Ecstasy and Cocaine
• Herbal supplements, including St. John’s wort and ginseng
• Cough and cold medicines that contain Robitussin DM and Sudal DM
• Anti-nausea medications
• Antibiotics (Zyvox),
• HIV AIDS medications such as Ritonavir (Norvirs)