I suffer from bad premenstrual migraines for which my gp has prescribed Imigran radis. These work well for me but the problem I have is that my gp will only prescibe 6 tablets a month which sometimes isn't enough. She said it was because I would develop resistance to them if I took more than this. I have read the info in the pack and googled but can find no info on this. The other day I was collecting a prescription and mentioned it to the woman in the chemist. She told me she gets 12 a month. These tablets mean that in that one week a month I can function and work instead of spending it in bed. Has anyone any experience of this please?