<<Disclaimer: Verify this information before applying it to your situation.>>

This site is helpful when you need to contact a drug manufacturer--
http://www.pharmacytimes.com/   Just click on the "Generic" capsule to find a
long list of companies and contact information.

  If you shop at Walgreens you can check out their site to get information
the the suppliers of their drugs  https://www.walgreens.com/   Look for 'Drug
Information"

(When I needed a prescription for amoxicillin filled, the information I
needed was on the label of the large drug bottle.  The pharmacist couldn't
seem to find it--just didn't know what he was looking for.  He gave me the
label to read but had torn it off at the ingredient listing!  Since you can't
call a drug company after business hours, it often pays to check the label
first.)

Bev in Milwaukee