DangerousContraindicated
Combining fluoxetine with St. John's Wort creates a high risk of serotonin syndrome. Fluoxetine has a long half-life (including its active metabolite norfluoxetine), meaning the risk persists for weeks after discontinuation. Multiple case reports document this dangerous interaction.
Recommendation: Do not take St. John's Wort with fluoxetine. Due to fluoxetine's long half-life, wait at least 5 weeks after stopping fluoxetine before starting St. John's Wort. Seek immediate medical attention for symptoms of serotonin syndrome.
SeriousContraindicated
5-HTP directly increases serotonin synthesis, while fluoxetine blocks serotonin reuptake. This combination can lead to serotonin syndrome. The risk is compounded by fluoxetine's long half-life, meaning serotonergic effects persist for weeks.
Recommendation: Do not combine 5-HTP with fluoxetine. Due to fluoxetine's long half-life, wait at least 5 weeks after discontinuing fluoxetine before starting 5-HTP.
SeriousCaution
SAMe increases serotonergic activity through multiple mechanisms. Combined with fluoxetine's potent and long-lasting SERT inhibition, the risk of serotonin excess increases. While some research has explored SAMe as SSRI augmentation, this should only occur under medical supervision.
Recommendation: Do not self-prescribe SAMe while taking fluoxetine. If being considered as adjunctive therapy, this must be done under close psychiatric supervision with gradual dose titration.
SeriousCaution
L-Tryptophan supplementation increases serotonin synthesis, and combined with fluoxetine's potent, long-lasting serotonin reuptake inhibition, can produce excessive serotonergic activity. Early case reports of this combination documented agitation, restlessness, and other serotonin syndrome symptoms.
Recommendation: Avoid supplemental L-tryptophan with fluoxetine. This was one of the first reported SSRI-supplement serotonin syndrome interactions. Dietary tryptophan from food is not a concern.
DangerousContraindicated
Fluoxetine combined with tramadol creates dual serotonin syndrome risk. Additionally, fluoxetine inhibits CYP2D6, reducing tramadol conversion to its active metabolite (O-desmethyltramadol), potentially reducing analgesic efficacy while increasing serotonergic toxicity risk.
Recommendation: Avoid concurrent use. The CYP2D6 interaction compounds the serotonin syndrome risk, making this combination particularly dangerous.
ModerateCaution
Fluoxetine is serotonergic. Rhodiola has preclinical monoamine and MAO-related findings, but direct human evidence for serotonin syndrome with Fluoxetine is limited. Combined use should be treated as a theoretical serotonergic-interaction risk, not as a proven prescription-MAOI-like contraindication. Fluoxetine and norfluoxetine persist for weeks, so prescriber guidance is especially important before adding or stopping serotonergic supplements.
Recommendation: Do not use Rhodiola to self-augment Fluoxetine. Discuss Rhodiola with the prescriber or pharmacist first, especially if other serotonergic agents are present, and seek care for serotonin-toxicity symptoms if both are used.
DangerousContraindicated
MDMA produces its effects by reversing the serotonin transporter; fluoxetine blocks that transporter. The result is unpredictable blunting of MDMA's effect alongside heavy serotonergic load, with documented risk of serotonin syndrome, hyperthermia, and death. Fluoxetine's long half-life (and its active metabolite norfluoxetine) extends this risk for weeks after the last dose.
Recommendation: Do not combine MDMA with fluoxetine. Because fluoxetine and norfluoxetine persist for 4-6 weeks, do not take MDMA for at least 5 weeks after stopping fluoxetine.
ModerateCaution
Fluoxetine substantially blunts psilocybin's psychedelic effects through chronic 5-HT2A receptor downregulation, and its very long half-life means the effect persists for weeks after stopping. There is also a theoretical risk of serotonin syndrome with combined serotonergic load.
Recommendation: Do not take psilocybin while on fluoxetine. Because fluoxetine and norfluoxetine have half-lives of 1-2 weeks and 1-2+ weeks respectively, wait at least 5 weeks after the last fluoxetine dose before any psilocybin exposure.
ModerateCaution
Fluoxetine depletes platelet serotonin and impairs aggregation, while high-dose fish oil adds modest antiplatelet activity. Observational data show SSRIs increase upper GI bleeding risk by roughly 55%; adding another antiplatelet substance compounds that risk.
Recommendation: Low-dose fish oil (≤1g/day) is generally compatible with fluoxetine. Avoid high-dose fish oil (>3g/day) unless your prescriber agrees, and watch for easy bruising, nosebleeds, or dark stools. Stop fish oil 7 days before surgery.
ModerateCaution
Fluoxetine depletes platelet serotonin and impairs aggregation; ginkgo's ginkgolides inhibit platelet-activating factor. The combination compounds bleeding risk, with ginkgo-plus-SSRI accounting for a substantial share of documented herbal-psychotropic bleeding complications.
Recommendation: Avoid Ginkgo biloba while on fluoxetine. Watch for bruising, nosebleeds, or GI bleeding if you have already combined them, and stop Ginkgo 7-14 days before any planned surgery.
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