Any of the pairs of nucleotides connecting the complementary strands of a molecule of DNA or RNA and consisting of a purine linked to a pyrimidine by hydrogen bonds. The base pairs are adenine-thymine and guanine-cytosine in DNA, and adenine-uracil and guanine-cytosine in RNA or in hybrid DNA-RNA pairing. Base pairs may be thought of as the rungs of the DNA ladder.
Drugs used to prevent migraines include: 1  Anticonvulsants, such as topiramate. 2  AntidepressantsAntidepressants, such as amitriptyline. 3  Antihistamine , such as cyproheptadine.  Beta-blockers, such as 1  propranolol. Botulinum toxinBotulinum toxin, such as Botox.  Calcium channel blockers, such as 1  verapamil. Histamine.
In my experience, most patients using the terms cluster migraine, cluster migraines, or cluster migraine headaches have frequent migraine headaches that cluster together in time. The term, cluster migraine, should be avoided to prevent confusion with the diagnosis of cluster headache.Before choosing any preventative, it is important to eliminate frequent headache triggers. For many patients, the most common triggers include irregular sleep, missed meals, caffeine, and chocolate.his medication, first licensed as an antiepileptic medication, is the most popular medication currently prescribed by neurologists for headache prevention. While not more effective than the other first line agents, it is the only one that is clearly associated with weight loss.