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.
The pain may be accompanied by extreme sensitivity to light and sound, nausea, and vomiting. In some people, migraines are preceded by visual disturbances known as auras that may include flashing lights, zigzag lines, or temporary blindness. Migraine medications do not cure migraines. Instead, migraine drugs treat the symptoms using one of two approaches. Some migraine drugs relieve symptoms. Other migraine drugs are used to prevent a migraine attack. Many migraine sufferers rely on simple pain relievers to get through an attack.