stimulant
6 interactions related to stimulant
adderall + st. john's wort
Adderall (mixed amphetamine salts) raises synaptic norepinephrine, dopamine, and to a lesser extent serotonin. St. John's Wort inhibits reuptake of those same monoamines. Together they can push the serotonergic system far enough to risk serotonin syndrome and can add cardiovascular strain. Separately, St. John's Wort strongly induces the CYP3A4 enzyme and P-glycoprotein, which can blunt the effect of many co-taken medicines.
methylphenidate + st. john's wort
Methylphenidate treats ADHD by inhibiting reuptake of dopamine and norepinephrine. St. John's Wort adds its own monoamine reuptake activity and is a strong inducer of the CYP3A4 drug-metabolising enzyme. A small published observation suggests St. John's Wort can blunt methylphenidate's effect on ADHD symptoms. There is also a theoretical, additive serotonergic risk, mainly relevant if other serotonergic drugs are present, but no confirmed serotonin syndrome cases have been reported for this specific pair.
ginseng + caffeine
Ginseng and caffeine are both mild stimulants, so combining them can additively increase alertness, jitteriness, palpitations, or insomnia in sensitive people, though the best evidence shows no meaningful cardiac signal from ginseng itself.
caffeine + adderall
Caffeine and the amphetamine salts in Adderall are both sympathomimetic stimulants. Taking them together adds their effects, so heart rate, blood pressure, jitteriness and trouble sleeping tend to be more pronounced than with either alone.
caffeine + yohimbine
Caffeine and yohimbine are both stimulants that activate the sympathetic ('fight or flight') nervous system through different routes. Caffeine blocks adenosine receptors and raises catecholamine output; yohimbine blocks alpha-2 adrenergic receptors, increasing norepinephrine release. Taken together they add to each other's effects on heart rate, blood pressure, and anxiety. Yohimbine-containing products have been linked to emergency-department visits and hospitalizations for fast heart rate, high blood pressure, and severe anxiety.
guarana + caffeine medications
Guarana seeds are an unusually concentrated source of caffeine, carrying several times the caffeine of coffee beans, and that caffeine adds directly to any caffeine-containing medication (such as Excedrin, Fioricet, Cafergot, Anacin, Esgic, NoDoz, or Vivarin). Because the caffeine is additive and easy to overlook, stacking guarana on top of these products can push total caffeine intake into a range linked to tachycardia, hypertension, jitteriness, GI upset, insomnia, and — in published case reports — serious cardiac arrhythmias.