SeriousCaution
5-HTP is a serotonin precursor, and rizatriptan is a 5-HT1B/1D receptor agonist. Direct case evidence for this exact pair is limited, but the combination is pharmacologically avoidable because both increase serotonergic signaling. Symptoms of concern include agitation, tremor, sweating, diarrhea, clonus, fever, or confusion.
Recommendation: Avoid 5-HTP supplements while using rizatriptan unless your prescriber specifically approves. If you have taken both and develop tremor, fever, marked restlessness, muscle jerks, or confusion, seek urgent care. Do not rely on dose spacing to remove the risk.
SeriousCaution
St. John's wort has serotonergic antidepressant activity and has documented interaction concerns with antidepressant drugs. Rizatriptan is a serotonin receptor agonist, so overlapping use may increase the risk of serotonin toxicity, although direct case evidence for this exact pair is limited. Warning signs include agitation, tremor, sweating, diarrhea, clonus, fever, or confusion.
Recommendation: Avoid St. John's wort if you use rizatriptan for migraines. If you are already taking St. John's wort, stop it and review alternatives with your prescriber. Seek urgent care if serotonin-toxicity symptoms occur after overlap.
DangerousContraindicated
MDMA causes large serotonin release and can trigger severe serotonin toxicity and hyperthermia. Rizatriptan is a serotonin receptor agonist, so taking it around MDMA exposure adds avoidable serotonergic activity during an already high-risk state. Risk is higher with overheating, dehydration, stimulants, antidepressants, or repeated triptan dosing.
Recommendation: Do not combine MDMA with rizatriptan. If MDMA was used, avoid taking rizatriptan and seek medical advice for severe headache, chest pain, high fever, confusion, muscle rigidity, or repeated vomiting. Treat fever, agitation, clonus, or confusion after overlap as an emergency.
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