This is beyond a public forum problem. You need to contact a business litigator immediately in your area. If your patients can't fill prescriptions and there are no "missing facts" above, you are the victim of various business torts designed to drive you out of business. Forget defamation - it's business torts.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Mr. Doland's advice is sound.
In addition, you may want to contact a staff investigator at CA Board of Pharmacy and ask for Pharm Board's assistance. Pharm Board may have sent out an alert about a physician with a similar name of business name (such alerts are being used extensively now; lots of media coverage). If there is that kind of error, Pharm Board can move quickly to rectify the origin of the problem and even send out affirmative correctives for you.
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