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Therapeutic Drug Monitoring in Psychiatry

Measuring blood levels of psychotropic medications to optimize efficacy and safety

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Psikiyatri department. Book Appointment →

What is Therapeutic Drug Monitoring in Psychiatry?

Therapeutic drug monitoring is the measurement of medication blood levels to support dosing decisions in clinical care. In psychiatry it is best established for lithium, clozapine, valproate, carbamazepine, and tricyclic antidepressants where the relationship between dose, level, and effect is well defined.

Indications include suspected nonadherence, unexpected response or toxicity, drug interactions, organ dysfunction, pregnancy, advanced age, and genetic polymorphisms in cytochrome P450 enzymes. Trough levels drawn at steady state and twelve hours after the last dose are most informative.

Reference ranges are guides rather than rigid targets, and clinical judgment integrates levels with symptoms, side effects, and patient context. Pharmacogenetic testing of CYP2D6 and CYP2C19 helps interpret unusual results and personalize psychiatric prescribing.

Symptoms

Lack of expected response despite adequate dose
Unexpected toxicity at standard dosing
Suspected nonadherence or covert use
Recent drug interactions or organ dysfunction
Plan for pregnancy or special populations

Risk Factors

Polypharmacy with cytochrome inhibitors or inducers
Hepatic or renal impairment
Pregnancy with altered pharmacokinetics
Pediatric or geriatric age groups
Known cytochrome P450 genetic variation

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • When response is poor despite adequate trial
  • When tremor, sedation, or confusion develops
  • When new medications change levels
  • When toxicity is suspected from clinical signs
  • When dose changes are made and follow-up is needed

Treatment Methods

01
Trough sampling at steady state
02
Interpretation in context of clinical response
03
Pharmacogenetic testing for CYP2D6 and CYP2C19
04
Dose adjustment guided by reference ranges
05
Adherence support and pillbox or digital reminders
06
Avoidance of interacting medications when possible
07
Multidisciplinary review with psychiatry and pharmacy

Which Department to Visit?

You can visit our Psikiyatri department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.