If you suffer from chronic migraines, are over 18 years of age, not pregnant, breastfeeding or planning for a pregnancy in the next 3 months you should consider injection therapy. You should also consider the therapy if at least 3 preventative medications provided from your doctor have limiting side effects or have been unable to provide you with significant benefit.
Preventative medications include: Propranolol, Pizotifen, Candesartan, Topiramate, Amitriptyline, Sodium Valpoate & Verapamil. Whilst Triptans are an effective acute migraine treatment they are not a preventative therapy.