M 358 is generic
Lortab 7.5 and contains 7.5 mg
hydrocodone and 500 mg
acetaminophen.
The imprint usually has nothing to do with the millgram content of the pill. It's just a unique identifier each company uses to identify its own pills. Generally there is no rhyme or reason to most imprints.
M 358 is made by Mallincrodt, and the company does follow a convention. Its hydrocodone/APAP tablets range in a sequence from M 357 to M 367, and each matches the NDC number. But it's not an indicator of strength.
More info:
http://acetaminophen.and.hydrocodone.drugs.com/ Off Topic
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I'm not a pharmacist or a medical doctor. This message is not medical advice, nor is at an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.