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white round pill with 503

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  • white round pill with 503

    my b/f has a whole bunch of these and i have no clue what they are. on one side they have 503 the other is a x or cross. i did the identifier and it came up with Cytoxan and Phenobarbital but those are not the pill.

    Please help.. Thanks...

  • #2
    503 is 4mg Tizanidine (generic Zanaflex), a muscle relaxant.

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    • #3
      it's a version of lorrtab i believe. it's a strong pain killer, taken by many recreationally. it's street names are 503 & footballs to name a couple.

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      • #4
        No, it is Tizanidine, you could be thinking of Watson 503 which is hydro/apap 10/650mg

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