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

My doctor prescribed Verapamil for me, and the tablets were
made by Mylan. My pharmacist could not give me their gf
status, but he gave me the (long, very fine print!) insert that
comes with his package and found their phone # for me:
1-800-826-9526.

I called today and talked to Eric, who assured me that Mylan
does not include any by-products of wheat, oats, barley or rye
in any of their products.

Good luck and good health!
Bobbi in Baltimore