When should you draw a trough level for medication?

The trough level of a medication is the lowest concentration of the drug in the bloodstream and is typically measured before the next scheduled dose is administered. This timing allows healthcare providers to assess whether the drug levels are within the therapeutic range, ensuring efficacy while avoiding toxicity.

Drawing the trough level 30 minutes before the next scheduled dose is ideal as it gives a snapshot of the drug's concentration just prior to the administration of the next dose. This timing is critical for medications that have a narrow therapeutic window, where the balance between therapeutic effects and potential side effects must be carefully monitored.

By obtaining the trough level at this point, clinicians can make informed decisions about whether to continue the medication, adjust doses, or switch medications if necessary based on the patient's response and drug levels.