When you take aspirin for a headache, how does the aspirin know to travel to your head and alleviate the pain?
that the amount of drug that reaches other sites is very low and unlikely to cause side effects.
Because remembering to take a drug several times a day is difficult for many people, researchers try to design drug formulations so they need to beSimilarly, pills, inhalers, or nasal sprays are more convenient than an infusion that requires traveling to a clinic for a trained clinician to inject it into your arm.
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