Is is safe to use outdated drugs to treat Wilsons Disease?
There are virtually no reports of toxicity from degradation products of outdated drugs. How much of their potency they retain varies with the drug and the storage conditions, especially humidity, but many drugs stored under reasonable conditions retain 90% of their potency for at least five years after the expiration date on the label, and sometimes much longer. H. Ascher Sellner, M.D.
