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Anyone know the difference among the formulations? I had a patient on Theophyline 200mg Capsules ER 24hr, but this time MD prescribed Theophylline 200mg Tablets CR. I am pretty sure they're not the same and had the patient follow up with the MD. I don't see any concrete information on the exact difference, 1 source did say that the Theophylline 200mg Tablets CR is a 12 hour release formulation. But who knows, all these ER, CR, XR, SR, DR, XL, etc formulations are very arbitary.
