Extended Release Generics — Are They the Same as the Original?

Below is list of popular generic drugs that are extended-release (also know as timed-release). Beside each is the corresponding brand name drug. But as with Wellbutrin, generic versions of extended-release drugs sometimes use a different tablet technology than the original. In such cases, the generic could potentially behave differently and act differently in your body. Keep this in mind if you think that a drug is not working like the original.

ConsumerLab.com will be reporting more information about many of these drugs to help you understand if and how they may vary from the original drugs. If you have had a problem with any of these, or any generic drug, please let us know by filling in our Generic Drug Report Form.

Extended-Release Generic Drugs (and corresponding original drugs)

  • Carbidopa/Levidopa ER (Sinemet CR) — Parkinson's disease treatment
  • Bupropion SR and XL (Wellbutrin SR and XL) — Anti-depressive
  • Clarithromycin ER (Biaxin XL) - Antibiotic
  • Diltiazem CD and Cartia XT (Cardizem CD) — Anti-hypertensive
  • Felodipine ER (Plendil) — Anti-hypertensive
  • Glipizide ER (Glucotrol XL) — Diabetes treatment
  • Indomethacin SR (Indocin SR) — Anti-inflammatory
  • Metformin HCL ER (Glucophage XR) — Diabetes treatment
  • Metoprolol Succinate ER (Toprol XL) — Anti-hypertensive, anti-anginal, heart failure treatment
  • Nifedical XL (Procardia XL) — Anti-hypertensive
  • Nifedipine ER (Adalat CC) — Anti-hypertensive
  • Verapamil SR (Calan SR) — Anti-hypertensive
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