Generic medicines that are different
In rare cases, branded medicines are prescribed because they are the most suitable product. If this happens to you, it’s important to stay on the branded medicine, rather than changing to a generic medicine.
For example, the body absorbs some medicines used to treat epilepsy in slightly different ways. This has a big effect on how the medicine works. In these cases, you should continue to use the brand you've been prescribed. Your GP will tell you if this is the right treatment for your particular condition.