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Appetite or weight changes on psychiatric medication: what to ask your doctor

Alanoud AlturkiMedical review: Tatmeen team8 min read
طعام وعبوة دواء ودفتر وسماعة طبية على طاولة، وفوقها فقاعتان تعرضان أطعمة وميزانًا وشريط قياس.
Article contents
  1. Is the medicine the cause?
  2. Make the conversation specific
  3. Monitoring depends on the medicine and your situation
  4. What options can you discuss?
  5. When should you contact the team before your usual appointment?
  6. Frequently Asked Questions
  7. Sources and references
  8. Writer and reviewer

If your appetite or weight changes after starting a psychiatric medicine, it deserves a clear conversation. You can value what treatment has helped with and also ask for an uncomfortable or concerning physical effect to be addressed. You do not have to choose between those needs.

The appropriate next step is to review the medicine and plan with the clinician who prescribes it, rather than stopping it or reducing the dose yourself. Causes and options differ between people, and weight alone does not measure a treatment's benefit or safety.

Is the medicine the cause?

Some psychiatric medicines can affect appetite or weight. Antipsychotic treatment needs planned physical health monitoring before and during treatment, including glucose and lipids; risks and details differ by medicine and situation. Appetite can change with a mental health condition or recovery, and possible physical causes deserve assessment too. A change after starting a medicine is useful information, but timing alone does not establish the cause.

The NHS lists weight gain as a possible antidepressant side effect1, while NICE antipsychotic guidance2 calls for discussion of effects on weight, glucose and lipids, and physical health monitoring. These are different groups of medicines. They do not all have the same effects or require the same tests for every person.

Make the conversation specific

Bring the names and doses of your medicines, including supplements and products bought without a prescription. Note roughly when the change started, whether it followed a new medicine or dose adjustment, and how it affects eating, sleep, energy and daily life. Bring recent measurements or test results if you have them; you do not need to weigh yourself daily before asking for a review.

You might begin:

“Treatment has helped me with …, but I have noticed … since … . I want to understand the cause and agree on a plan that protects the improvement and my physical health.”

If you have not noticed a clear benefit yet, or are unsure what has changed, say so too. You do not have to report an improvement before raising a concern.

Also tell your doctor if concerns about weight have led you to miss doses or restrict food, so you can agree on a safe plan you can keep up.

What you want to understand A question you can ask
Whether treatment contributed to the change Does the timing fit this medicine, and should we investigate other causes?
The benefits you want to preserve How do we assess improvements in sleep, mood or everyday functioning?
Appropriate physical follow-up Which measurements and tests are needed for my medicine and situation, and who reviews the results?
Managing an unwanted effect What options are available, and what are their benefits and risks for me?
Reviewing the decision When will we review the plan, and what symptoms should prompt earlier contact?

Monitoring depends on the medicine and your situation

With an antipsychotic, monitoring usually includes weight, blood pressure, waist circumference, glucose or HbA1c, and blood lipids before and during treatment. Your team sets the schedule using the medicine, your circumstances and the relevant guidance. Antidepressants and other psychiatric medicines may need different follow-up; an antipsychotic monitoring schedule should not automatically be applied to them.

Stable weight alone cannot tell you whether glucose or cholesterol is healthy, and weight gain alone does not mean you have diabetes. Measurements and tests help assess health and guide support; they are not grades for personal success. NICE guidance on antipsychotics used in depression3 calls for investigating and managing rapid weight gain or abnormal glucose or lipids, while reviewing physical and mental health risks.

If a primary care doctor and psychiatrist share your care, ask who orders and reviews the tests. Bringing results and a medicine list to both appointments can help prevent information from being left between teams without a clear plan.

What options can you discuss?

The plan may involve understanding the cause, support with food and activity suited to your needs and abilities, or treating a physical problem that has appeared. It may be possible to address the effect while continuing a medicine that has helped you, or your clinician may recommend a change. The decision depends on the impact of the side effect, previous treatment, current benefit and the risks of changing treatment.

If you take an antipsychotic, you can ask: “Can we address the weight gain while keeping the treatment that helped me? Is metformin an option worth assessing in my situation?” Specialist guidance for adults with psychotic illnesses4 discusses this option for some antipsychotic-related weight gain. It does not suit everyone; your clinician reviews your health, kidney function, tolerability and other options. Discuss its suitability with your doctor and do not start it yourself. A particular amount of weight loss cannot be guaranteed.

If your clinician proposes a change, ask how the transition and follow-up will work, and what to do if symptoms return or new effects appear. Do not borrow someone else's dose-reduction plan. The NHS explains that suddenly stopping antidepressants can cause withdrawal symptoms1. Reviewing an antipsychotic also needs a plan with the specialist and attention to returning symptoms.

Do not start a supplement or slimming product to manage a side effect without discussing it with your doctor or pharmacist. Show them the product name and ingredients; describing it as “natural” does not establish whether it suits your treatment. Specialist dietary support can be part of care when useful, without a harsh diet or an expectation that you solve the problem alone.

When should you contact the team before your usual appointment?

Contact your doctor if the change is rapid or concerning, you develop marked thirst or more frequent urination5, or the side effect makes you want to stop treatment. These signs do not diagnose a condition; describe them so the team can decide on assessment. If fear of weight gain or eating difficulties leads to severe restriction, self-induced vomiting or repeated loss of control over eating, ask for specialist support too. The NHS explains that these difficulties can need eating-disorder assessment6.

Loss of consciousness, breathing difficulty or sudden serious deterioration needs emergency care. If you may harm yourself or cannot keep yourself safe, seek urgent help and ask a safe person to stay with you if possible. Do not delay help if no companion is available. In Saudi Arabia, the Saudi Red Crescent Authority7's ambulance number is 997.

You deserve a clear plan at the end of the conversation: what will be monitored, what will be done and when the decision will be reviewed. Looking after physical health belongs within ongoing mental health care.

Frequently Asked Questions

Can psychiatric medication cause weight gain?

Yes, some psychiatric medicines can affect appetite or weight. But appetite can also change with a mental health condition or recovery, and possible physical causes deserve assessment too. A change after starting a medicine is useful information, but timing alone does not establish the cause, and different medicines do not all have the same effects.

Should I stop my medication if I gain weight?

Do not stop it or reduce the dose yourself; the appropriate next step is to review the medicine and plan with the clinician who prescribes it. Suddenly stopping antidepressants can cause withdrawal symptoms, and reviewing an antipsychotic also needs a plan with the specialist. Also tell your doctor if concerns about weight have led you to miss doses or restrict food.

What tests are needed with antipsychotic medication?

With an antipsychotic, monitoring usually includes weight, blood pressure, waist circumference, glucose or HbA1c, and blood lipids before and during treatment. Your team sets the schedule using the medicine and your circumstances. This schedule should not automatically be applied to antidepressants or other psychiatric medicines. Stable weight alone cannot tell you whether glucose or cholesterol is healthy, and weight gain alone does not mean you have diabetes.

What are the options if my medication causes weight gain?

The plan may involve understanding the cause, support with food and activity suited to your needs, or treating a physical problem. It may be possible to address the effect while continuing a medicine that has helped you. With an antipsychotic, you can ask whether metformin is worth assessing; it does not suit everyone, so do not start it yourself. Do not start a supplement or slimming product without discussing it with your doctor or pharmacist.

When should I contact my doctor before my usual appointment?

Contact your doctor if the change is rapid or concerning, you develop marked thirst or more frequent urination, or the side effect makes you want to stop treatment.

Loss of consciousness, breathing difficulty or sudden serious deterioration needs emergency care. If you may harm yourself or cannot keep yourself safe, seek urgent help and ask a safe person to stay with you if possible. Do not delay help if no companion is available. In Saudi Arabia, the ambulance number is 997.

Writing and article review

Alanoud AlturkiWritten byAlanoud Alturki

Content writer and researcher at Tatmeen, writing in Arabic and English on mental health and everyday life topics, including relationships, stress, work, habits, and family.

Tatmeen teamMedical reviewTatmeen team

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