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•    The dosage of medication needed for a therapeutic effect can vary with age, weight, gender, health status and environmental factors.
•    Most drugs produce a mixture of therapeutic and adverse effects.
•    Medications require a written order from a physician or a nurse practitioner legally permitted to prescribe them.
•    Because most drugs are metabolized in the liver, it is especially susceptible to drug induced injury.
•    The nurse is responsible to judge independently before giving a prescribed medication.
•    The route of administration will be chosen to achieve a certain therapeutic action, at a certain speed.
•    Medications interact with foods, and that interaction can block or slow therapeutic action
•    People metabolize medications differently, depending on age, gender, body size, health status, drug tolerance, cumulative effect of medication, and genetics.
•    Inhalers are most effective when their users know the right technique. Teach the technique and then test how well the client uses it.
•    Medications are especially likely to cause hypotension in elderly people.
•    There are two types of drug dependence: psychic and physical. Psychic dependence implies a craving to use the drug periodically. Physical dependence implies physical symptoms when the drug is withheld.