Dear Deanne,

The problem is that even though all companies are held to strict tolerances as to variance of dosage amount in their warfarin tablets, they are not held to not varying from company to company.

Though you can be confident that there is very little variability from one tablet to another from the same company, going from one company to another as happens with generics introduces unregulated variability.

Put a different way, there is little intracompany variability but unpredictable intercompany variability in warfarin dose for their respective warfarin tablets (5 mg in your specific case).

Solution:

Here is what we do in our cardiac clinic...

... we switch folks from ordinary generics to a branded generic.

The latter is from a company that has recognized the above problem and has opted to use this their competitive edge.  They make warfarin and retail it at the same price as the generic companies but have a brand name that a doctor can prescribe as brand necessary.

The branded generic we prescribe is Jantoven made by Upsher-Smith:

http://www.jantoven.com/about.html

Disclosure: No financial ties with Upsher-Smith.

Hope this information proves helpful in saving some money for you and your insurance company. 

Congratulations on the new addition to your family :-)