Can You Take Ceylon Cinnamon With Prozac (Fluoxetine)?

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Ceylon cinnamon doesn't have any well-documented interaction with Prozac (fluoxetine), and a 500 mg daily dose isn't expected to cause a problem for most people taking 20 mg of fluoxetine. It's worth saying up front that this combination hasn't been formally studied in humans, so what we can offer is a look at how each one works and where any theoretical overlap might be.

Why a Significant Interaction Isn't Expected

Prozac's most important interactions fall into a few predictable categories. The biggest concern is combining it with other serotonergic substances, since the prescribing information warns that pairing fluoxetine with other drugs that raise serotonin increases the risk of serotonin syndrome.

Ceylon cinnamon doesn't have meaningful serotonergic activity, so it doesn't fall into that group.

Fluoxetine also inhibits a liver enzyme called CYP2D6, which is why it can raise levels of certain other prescription drugs, but cinnamon isn't a known CYP2D6 substrate and isn't expected to be affected by that mechanism either.

In short, Ceylon cinnamon simply doesn't fit the profile of the substances fluoxetine is known to clash with.

What Ceylon Cinnamon Does in the Body

Ceylon cinnamon, sometimes called "true" cinnamon, comes from the Cinnamomum verum tree and is most often taken as a supplement for blood sugar and cholesterol support. A couple of its effects are worth knowing about, even though neither points to a direct conflict with Prozac.

First, cinnamon may modestly lower blood glucose, a concern that mainly matters for people on diabetes medications rather than antidepressants.

Second, very high intakes of cinnamon have been associated with mild effects on blood clotting, and this is where a small theoretical overlap exists, because SSRIs like fluoxetine can slightly impair platelet function too (serotonin released by platelets helps blood clot normally).

At a moderate 500 mg daily dose of the Ceylon variety, this is a theoretical point rather than a practical worry for most people, but it's a good one to mention to your pharmacist if you take a blood thinner, aspirin, or NSAIDs regularly.

One reassuring detail is that Ceylon cinnamon naturally contains far less coumarin, the compound linked to liver concerns and blood-thinning effects at high doses, than the more common cassia cinnamon.

Final Words

Overall, 500 mg of Ceylon cinnamon isn't expected to interfere with your 20 mg of Prozac, and there's no known interaction between the two. Since herb-drug combinations aren't always well studied, it's a good idea to let your pharmacist or doctor know you're adding it, especially if you take other medications that affect blood sugar or bleeding.

Feel free to reach out again anytime, we're always happy to help!

You may also find these related HelloPharmacist resources helpful:

• Ceylon Cinnamon drug interactions and safety information