What is the difference between tretinoin and isotretinoin. Is retin a micro gel similar to isotrex topical gel, are they basically the same product?

Both are Vitamin A's. One is a cream/gel the other one is a pill. Accutane and Retin-A are both forms of vitamin a, just in different forms. Retin-a or tretinoin (generic name) is a cream/gel is applied to the face and it works from the outside in. Accutane (isotretinoin) is a high dose of vitamin a just like Retin-A is, but instead it is in a oral medication that works from the inside out.
Isotrex. And Retin-A are the same product, just different manufacturers. Isotretinoin, ("accutane") is a pill, not a cream - quite different.