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.
Topiramate is a seizure medication, also called an anticonvulsant. Topiramate is used alone or in combination with other medications to treat seizures in adults and children who are at least 2 years old.Topiramate is also used to prevent migraine headaches in adults.Topiramate will only prevent migraine headaches or reduce the number of attacks. It will not treat a headache that has already begun. Topiramate may also be used for purposes not listed in this medication guide.opiramate will only prevent migraine headaches or reduce the number of attacks. It will not treat a headache that has already begun. Topiramate may also be used for purposes not listed in this medication guide.