Caution

Two stimulants strain the heart and brain, usually over a long session of redosing.

Do this

Decide the total for the night in advance.

General answer for Amphetamines: nothing specific to these two is documented.

Where the risk isTap for why
What “Caution” means

Carries risk that is worth understanding before combining. Reduce doses and do not use alone.

How the ratings work
The longer explanation

Additive cardiovascular and neurotoxic strain from two stimulants, with a long, heavily-redosed session the typical pattern.

Sources (3)
Other names
Mephedrone
4-mmc, 4mmc, meow, m-cat, 4-methylmethcathinone, bath salts
Methylphenidate
ritalin, ritalin la, concerta, focalin, dexmethylphenidate, methylin
Not an amphetamine, but mixes much like one — most answers here are Adderall's
Also searched asmeow and Ritalin, m-cat and Ritalin, meow and ritalin la, m-cat and ritalin la

Related combinations

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Can you mix Mephedrone (meow) and Methylphenidate (Ritalin)?

MixSafe rates mixing Mephedrone and Methylphenidate as "Caution" — carries risk that is worth understanding before combining. Reduce doses and do not use alone. No interaction specific to Mephedrone and Methylphenidate is documented; this is the default for Amphetamines. Source: MixSafe research. Educational information, not medical advice.

This is a class-level answer, inherited from Amphetamines. Nothing specific to this exact pair is documented, so treat it as the default for the class rather than a measurement of these two drugs together.