Good approach is to educate him with his own literature: print the PDF file, below, and give it to him.
Expect that folks will tell you about their experience with Lithium. It has a long history and so benefits, side effects, etc. are well known.
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Message posted here:
Experimental preventive. As of 3/16/10, no medical information on PubMed but this information from Dr. Goadsby.
He reports that docs in the Los Angeles area have been trying as a preventive when the standard ones are not working and that good results.
Namenda (memantine hydrochloride) used for Alzheimer's patients and has more use with migraine.
For Cluster, clearly experimental now. Start low, Val found relief after working up to 15mg. (I should not jump to use unless you have exhausted the standard preventives.)
Information from: Val, on 3/16/10, in medications section.
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Nice that you like your doc but, with tough situations, having a specialist on the team is worth considering. This is especially so because most docs have little useful education/experience dealing with Cluster. At the very least, might ask your doc if a consult with a specialist would make both of you more comfortable.
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LOCATING HEADACHE SPECIALIST
1. Search the OUCH site (button on left) for a list of recommended M.D.s.
2. Yellow Pages phone book: look for "Headache Clinics" in the M.D. section and look under "neurologist" where some docs will list speciality areas of practice.
3. Call your hospital/medical center. They often have an office to assist in finding a physician. You may have to ask for the social worker/patient advocate.
4. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

; On-line screen to find a physician.
5. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

Look for "Physician Finder" search box. They will send a list of M.D.s for your state.I suggest using this source for several reasons: first, we have read several messages from people who, even seeing neurologists, are unhappy with the quality of care and ATTITUDES they have encountered; second, the clinical director of the Jefferson (Philadelphia) Headache Clinic said, in late 1999, that upwards of 40%+ of U.S. doctors have poor training in treating headache and/or hold attitudes about headache ("hysterical female disorder") which block them from sympathetic and effective work with the patient; third, it's necessary to find a doctor who has experience, skill, and a set of attitudes which give hope of success. This is the best method I know of to find such a physician.
6. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

NEW certification program for "Headache Medicine" by the United Council for Neurologic Subspecialties, an independent, non-profit, professional medical organization.
Since this is a new program, the initial listing is limited and so it should be checked each time you have an interest in locating a headache doctor.