My Boyfriend Might Have Autoimmune Hepatitis Due To Drug Toxicity

My boyfriend might have autoimmune hepatitis due to drug toxicity (statins mixed with omeprazole, Plavix, gemfibrozil, and blood pressure medicine). A liver biopsy is scheduled. I'm obviously hoping it's just acute toxicity and he will get better. I've read about cholestatic hepatitis. It looks like toxicity can cause this as well. I just can't find out if it's curable. Autoimmune hep isn't and that's just not an acceptable thought right now!!! Could it be cholestatic and is that reversible?