Low risk, no synergy

Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.

Do this

Treat each one as if you had taken it alone: its own dose, its own risks.

Reported

No specific interaction is documented. Melatonin is a mild sedative, so the general rule is that it adds drowsiness to anything else sedating and does little to anything else.

What “Low risk, no synergy” means

Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.

How the ratings work
Sources (3)

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Other names
Melatonin
sleep hormone, circadin
Methylphenidate
ritalin, ritalin la, concerta, focalin, dexmethylphenidate, methylin
Not an amphetamine, but mixes much like one — most answers here are Adderall's
Also searched asmelatonin and Ritalin, melatonin and ritalin la

Related combinations

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Can you mix Melatonin and Methylphenidate (Ritalin)?

MixSafe rates mixing Melatonin and Methylphenidate as "Low risk, no synergy" — neither substance is expected to meaningfully change the other. Both still carry their own individual risks. Source: MixSafe research. Educational information, not medical advice.