Psychiatry: treatments
Clinical pharmacotherapy & safe prescribing
Clinical pharmacotherapy is the everyday skill of choosing, starting, adjusting and stopping psychiatric medicines safely for a real person. It turns pharmacology knowledge into prescriptions that balance benefit, side effects, physical health and the patient's own wishes.
Depth by stage, Pre-U → Consultant (details)
What is it?
Most people who see a psychiatrist will at some point be offered medicine. Clinical pharmacotherapy is the practical art behind that offer: picking the right drug for the diagnosis and the person, at the right dose, for the right length of time, and watching closely for benefit and harm.
It is different from basic psychopharmacology, which explains how drugs act on receptors and brain chemistry. Here the questions are practical: which antidepressant suits a pregnant woman, how to switch an antipsychotic without a relapse, what blood tests lithium needs, how to stop a benzodiazepine gently, and how to explain all of this so the patient can make an informed choice.
Safe prescribing also means knowing interactions with medicines from other doctors, adjusting doses for children, older adults, kidney or liver disease, and following Malaysian rules for controlled drugs and the MOH drug formulary.
Why does a psychiatrist need it?
Medication is one of the psychiatrist's most powerful and most risky tools. A good prescriber can bring someone out of psychosis or severe depression; a careless one can cause weight gain, diabetes, heart rhythm problems, falls, dependence or a fatal overdose. Psychiatrists are the doctors other clinicians turn to when psychiatric medicines become complicated, so they must be the most careful prescribers in the room.
What level is expected at each stage?
Scale: 1. Aware → 2. Understands → 3. Applies → 4. Masters / Teaches. What the levels mean.
- Pre-UNot expected
- Pre-clinicalAwareKnows the main drug classes exist and their basic mechanisms from pharmacology lectures.
- ClinicalUnderstandsCan name first-line drugs for common disorders and their key side effects for exams and ward rounds.
- HousemanshipUnderstandsCharts and continues psychiatric medicines prescribed by others, spots obvious interactions and side effects.
- Medical officerAppliesStarts and adjusts common medicines under specialist supervision and monitors physical health.
- Psych traineeAppliesPrescribes independently for most patients, manages treatment resistance, clozapine, lithium and special populations.
- Specialist / consultantMasters / TeachesHandles the most complex cases, sets local prescribing policy and teaches safe prescribing.
What are the key topics?
Main drug classes in practice
- Antidepressants: SSRIs, SNRIs, mirtazapine, tricyclics, MAOIs, agomelatine, vortioxetine, bupropion
- Antipsychotics: first- and second-generation, long-acting injectables (depots), clozapine for treatment-resistant schizophrenia
- Mood stabilisers: lithium, valproate, carbamazepine, lamotrigine
- Anxiolytics and hypnotics: benzodiazepines, z-drugs, pregabalin, melatonin
- ADHD medicines: methylphenidate, atomoxetine and others
- Dementia medicines: cholinesterase inhibitors and memantine
- Medicines for addiction: methadone, buprenorphine, naltrexone, acamprosate, disulfiram, nicotine replacement and varenicline
Choosing and monitoring treatment
- Matching drug to diagnosis, symptom profile, past response and patient preference
- Shared decision-making: explaining benefits, side effects and alternatives
- Baseline and follow-up tests: weight, BMI, waist, blood pressure, glucose/HbA1c, lipids, ECG (QTc), prolactin
- Lithium levels, kidney and thyroid function; valproate and carbamazepine levels and liver tests
- Clozapine full blood count monitoring and myocarditis awareness
- Rating response with scales and agreeing how long a fair trial lasts
Side effects and emergencies
- Extrapyramidal side effects: dystonia, parkinsonism, akathisia, tardive dyskinesia
- Metabolic syndrome, weight gain and diabetes risk
- Neuroleptic malignant syndrome and serotonin syndrome
- Lithium toxicity and drug interactions that raise lithium levels
- Hyponatraemia in older adults on antidepressants
- Sexual dysfunction and adherence problems
- Overdose risk and limiting quantities supplied to at-risk patients
Special populations
- Pregnancy and breastfeeding: weighing risk to mother and baby (e.g. valproate avoided in women who could become pregnant)
- Children and adolescents: off-label use, careful dose titration, suicidality warnings
- Older adults: lower doses, falls, anticholinergic burden, delirium
- Kidney, liver and heart disease
- People on many other medicines (polypharmacy) and drug–drug interactions via liver enzymes
Difficult situations
- Treatment-resistant depression and schizophrenia: augmentation, combination, clozapine
- Switching and cross-tapering between drugs
- Stopping medicines safely: discontinuation symptoms and benzodiazepine tapering
- Rapid tranquillisation for severe agitation, following local protocols
- Prescribing within the Mental Health Act for patients who lack capacity or refuse treatment
- Controlled drugs rules and the MOH medicines formulary in Malaysia
How is it learned and assessed?
- Pharmacology lectures and therapeutics teaching in medical school; prescribing questions in final MBBS OSCEs
- Supervised prescribing on wards as house officer and medical officer, with pharmacist feedback
- MMed (Psychiatry) Part I tests basic psychopharmacology; Part II tests clinical prescribing through long and short cases and written papers
- MRCPsych Paper A covers psychopharmacology science; Paper B and the CASC test applied prescribing and explaining medicines to patients
- Case-based discussions and supervision during training; consultants keep up through CPD and guideline updates
Typical textbooks and resources
- The Maudsley Prescribing Guidelines in Psychiatry — Taylor, Barnes & Young; the standard practical prescribing reference
- Stahl's Essential Psychopharmacology and Prescriber's Guide — Stephen M. Stahl
- British National Formulary (BNF) — for doses, interactions and cautions
- MOH Malaysia Clinical Practice Guidelines on depression, schizophrenia and bipolar disorder
- NICE guidance on psychosis, depression and bipolar disorder (UK)
Titles are widely used examples; editions change. Use university libraries or legitimate purchases.
Common questions
Do psychiatrists only treat patients with medicine?
No. Medicine is one tool among many. Good psychiatrists combine medicine with talking therapies, family work and practical support, and many patients do well without medicine at all. The skill lies in knowing when medicine helps and when it does not.
Why do psychiatric medicines need blood tests?
Some medicines, like lithium and clozapine, can be harmful at the wrong level or can affect blood cells. Others, especially antipsychotics, can raise weight, sugar and cholesterol. Regular tests let the psychiatrist catch problems early and keep the patient physically healthy.