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Brand versus Generic Drugs

Is there any difference between the Generic versus Brand name drug as far as withdrawal is concerned?

Generic drugs are defined to be drugs that are the same as brand named drugs in strength, route of administration, quality and performance characteristics and intended use.

The law allows the bioavailability of a genetic drug to differ from a brand name drug by 80 125%.

Bioavailability is a measurement of the rate and extent that a therapeutically active drug reaches the systemic circulation and is available at the site of action. By definition, when a medication is administered intravenously, its bioavailability is 100%. However, when a medication is administered via other routes (such as by mouth), its bioavailability decreases.

Variations of 80 125% can cause problems for some disorders and some people when swapping between brand and generic drugs. This has been observed in anti-seizure drugs and blood pressure medication.

Another factor that may affect the switch from an original drug to a generic drug is the possibility of impurities being left behind at some stage during the manufacturing process. The manufacturing process of the drugs does not have to be identical. A good example of this was the Tryptophan contamination that occurred in the US in the 1990s.

There has been discussion on the board that the average amount of drug in each pill or in each part of a pill may vary more with generics than in brand name drugs. There is some discussion but no scientific data on the Internet that suggests clonazepam may not be as strong as Klonopin.

It may be wise to avoid changing from brand to generic or visa versa while withdrawing if that is possible.

Some sites

http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=161740

 

 

Disclaimer:  The information contained in this website was not compiled by a doctor or anyone with medical training. The advice contained herein should not be substituted for the advice of a physician who is well-informed in the subject matter discussed. Before making any decisions about your health or treatment you should always confer with your physician and it is always assumed that you will do so.

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Last updated 22 July 2015