Is there a big difference between generic and non generic medication?

Generic medications can be not as effective as Brand, and each generic type will vary in effectiveness.

I had to switch to brand Valium because I was allergic to the generic that my mail-order pharmacy sends me. Also, certain generic forms of Valium tend to degrade very quickly. This isn't true with the brand.

Perhaps you could ask your pharmacy to order you the more effective generic (look on the bottle to see which Drug Company made the peach type, and ask your pharmacy to order you that type. They will do this at no cost to you. I had a problem with Teva Gabapentin, and I wrote "NO TEVA GENERIC PLEASE, I'M ALLERGIC" on the top of my prescription.

Whether you're actually allergic or not, the pharmacy will definitely order the different type of generic if you convey that a certain generic type is harmful to you to prevent lawsuits.