5-Htp Interactions

5-HTP is the direct precursor to serotonin and bypasses the rate-limiting step of serotonin synthesis. Combined with an MAOI, which blocks serotonin breakdown, intracellular and synaptic serotonin can rise to toxic levels, producing serotonin syndrome.

Sertraline blocks serotonin reuptake and 5-HTP (5-hydroxytryptophan) is the immediate biochemical precursor of serotonin, so it directly increases serotonin synthesis. Combining the two stacks production and reuptake blockade, which can precipitate serotonin syndrome.

Both trazodone and 5-HTP increase central serotonin activity. Trazodone blocks the serotonin transporter and acts on 5-HT2 receptors, while 5-HTP is a direct precursor to serotonin and bypasses the normal regulation of tryptophan availability. Combining them can produce additive serotonergic effects and risk of serotonin syndrome.

Tramadol inhibits serotonin reuptake, and 5-HTP is a direct precursor to serotonin that increases central serotonin synthesis. Combining them can cause serotonin syndrome, a potentially life-threatening reaction.

Fluoxetine is an SSRI that blocks serotonin reuptake, and 5-HTP is the direct precursor that the body converts into serotonin. Combining them can raise synaptic serotonin to levels associated with serotonin syndrome, and fluoxetine's long-lived active metabolite norfluoxetine extends this risk for weeks after the last dose.