MAJOR — Use With Caution
🔴 CAUTION — Major interaction between Fluoxetine and Cyclobenzaprine. Avoid unless under direct medical supervision.
Evidence level: STRONG
Prozac increases Flexeril levels AND both affect serotonin. Risk of Serotonin Syndrome and excessive sedation.
Fluoxetine inhibits CYP2D6 → increased cyclobenzaprine levels + additive serotonergic effects → Serotonin Syndrome risk.
Fluoxetine affects how your body processes Cyclobenzaprine, which may change its effectiveness. Your doctor may need to adjust dosages or consider an alternative. Do not change doses on your own.
Take Fluoxetine at the same time each day — morning is most common to avoid sleep disruption. Cyclobenzaprine follows its prescribed schedule. SSRIs have a long half-life, so consistency matters more than the exact hour.
Higher risk with: high doses, multiple serotonergic agents, older age, recent dose changes, CYP2D6 poor metabolizer status, liver impairment.
Agitation, restlessness, confusion, rapid heartbeat, dilated pupils, muscle twitching or rigidity, heavy sweating, diarrhea, high temperature.
Ask your doctor: "Is there a safer alternative to Cyclobenzaprine that I can take with Fluoxetine?" Bring a list of ALL supplements and medications you take.
Discuss this combination with your prescriber. They may adjust timing, dosing, or switch to an alternative with fewer interaction risks. Never stop an antidepressant abruptly — taper under medical guidance.
Prozac increases Flexeril levels AND both affect serotonin. Risk of Serotonin Syndrome and excessive sedation.
Take Fluoxetine at the same time each day — morning is most common to avoid sleep disruption. Cyclobenzaprine follows its prescribed schedule. SSRIs have a long half-life, so consistency matters more than the exact hour.
Agitation, restlessness, confusion, rapid heartbeat, dilated pupils, muscle twitching or rigidity, heavy sweating, diarrhea, high temperature.
Discuss this combination with your prescriber. They may adjust timing, dosing, or switch to an alternative with fewer interaction risks. Never stop an antidepressant abruptly — taper under medical guidance.
Ask your doctor: "Is there a safer alternative to Cyclobenzaprine that I can take with Fluoxetine?" Bring a list of ALL supplements and medications you take.
Or browse the full interaction database (121,000+ pairs).