There are various sampling methods. The one chosen will depend on a number of factors (such as time, money etc.). 1. Random Sampling Everyone in the entire target population has an equal chance of being selected. This is similar to the national lottery.
Various types of medications have been evaluated for migraine prophylaxis, including beta blockers, antidepressants, anticonvulsants, nonsteroidal anti-inflammatory drugs (NSAIDs), angiotensin blockade agents, and calcium channel blockers.
There are many different preparations of analgesics so the brand names are too numerous to mention. Several combination preparations are available. The most commonly used contain aspirin or paracetamol combined with codeine, caffeine and/or an anti-emetic. Combinations specifically licensed for migraine include: