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.
Tension headache: Nonsteroidal anti-inflammatory drugs (NSAIDs) are usually sufficient to get rid of a tension headache, although it may take a few days. Migraine: There are many different types of migraines, so only your doctor can prescribe the best possible course of treatment for symptoms of migraine attacks. There is no cure for migraine illness, but by using daily migraine preventative treatments, many are able to thwart off the majority of migraine headaches and symptoms of nausea, dizziness, and fatigue.