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is a medicine that is a muscle relaxant
and it is often used in Chronic Fatigue Syndrome
is often also used in this condition. Meloxicam is a NSAID drug. So far as per my opinion there is no serious harmful effect of using marijuana or weed smoke with these drugs.
But smoking weed has very harmful effects the effects produced with weed tend to nullify the effects of there medicines. And smoking weed usually have always serious consequences. So try to motivate him to quit the bad habit.
Thanks AND Take Care