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Drug levels are taken on a sample of blood from a vein.
Drug levels are usualy requested to check whether a drug dose needs to be adjusted, or to determine whether the level of the drug in the bloodstream is too high or too low.
When the level is within the therapeutic range, between the lower value and the higher value of the laboratory reference range, the dose is usually correct, but it is possible to get symptoms, side effects, or inadequate control of symptoms within this range and the dose may need to be adjusted according to your doctor’s clinical assessment.
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