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.
Botox Common Migraine Treatment. Best known as a cosmetic therapy to banish facial frown lines, botulinum toxin type A, or Botox, was approved to prevent migraines in 2010, but only for patients who experience 15 or more migraine headaches a month.mong chronic sufferers who had at least 15 migraines a month, the treatment prevented, on average, about two headaches a month. Botox was no more effective than some of the most widely prescribed drugs used for migraines when the treatments were compared.