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.
Finding the right migraine drug for you. There are two groups of drugs for treating migraine: acute medicines â treatment taken when the migraine starts. prophylactic / preventive medicines â treatment to prevent an attack.