So sorry - we missed your post earlier.
Your capsule is
diltiazem xr 180 made by Andrx.
Gray capsule, white body, imprint "Andrx 549" is Diltia XT® (diltiazem HCl extended release 180 mg).
You can find an image at drugdigest.org
More info:
http://diltiazem.drugs.com/
I'm not a pharmacist or a medical doctor. This message is not medical advice nor is it an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.