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.
What kinds of medicine can cause rebound headache? Both prescription and over-the-counter medicines for migraine (such as aspirin and acetaminophen) can cause headache if you take them too often. These medicines should not be taken on more than two days per week. Sedatives, tranquilizers, and ergotamine medicines also can cause rebound headache.