The therapeutic level of theophylline is directly related to the blood levels achieved from the administration of the medication on a regular schedule.Which factors affect therapeutic levels? (Select all that apply.)

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Factors affecting therapeutic theophylline blood levels are variance in rate of absorption,metabolism,and elimination of the drug; differing levels of theophylline in each product; and the patient's age.

The Therapeutic Level of Theophylline Is Directly Related to the Blood