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Track the exact medicine in this category
Mental health medicines can have different availability by brand, strength and formulation. Use the category page for context, then track the medicine page that matches your prescription.
If you have already run out, an emergency supply is usually faster than ringing round. Pharmacists cannot make an emergency supply of Schedule 1, 2 or 3 controlled drugs, such as ADHD stimulants, whoever asks (phenobarbital for epilepsy is the only exception): you need a new prescription, from your prescriber or through NHS 111. If you are still looking, check the national shortage status before you travel.
Get an emergency supply → Check stock & shortage status →⚠️ Never Stop Mental Health Medication Abruptly
Suddenly stopping antidepressants or antipsychotics can cause dangerous discontinuation symptoms including severe anxiety, dizziness, nausea, electric shock sensations ("brain zaps"), insomnia and, rarely, seizures.
If your medication is unavailable: contact your pharmacy immediately. There is no Serious Shortage Protocol for any mental health medicine (NHSBSA, checked 17 October 2026), so any change of medicine, strength or form needs your prescriber. If nothing is available, see your GP the same day.
In crisis? Call the Samaritans on 116 123 (free, 24/7) or NHS 111.
Can You Suddenly Stop Venlafaxine or Quetiapine?
No — never stop venlafaxine or quetiapine abruptly, even if your pharmacy is temporarily out of stock. Both carry a well-documented discontinuation/withdrawal risk, and NHS guidance is explicit that any change in dose, brand or formulation should be managed by a prescriber, not decided by stock availability on the day.
Venlafaxine: why abrupt stopping is especially risky
Venlafaxine has one of the shortest half-lives of any commonly prescribed antidepressant, so missing even one or two doses can trigger discontinuation symptoms — dizziness, "brain zaps," nausea, anxiety and flu-like symptoms — within 24 hours. If your usual strength or brand is out of stock, ask your pharmacist first; there is no Serious Shortage Protocol for venlafaxine, so switching between immediate-release and modified-release needs your prescriber. If nothing is available, contact your GP or NHS 111 the same day rather than reducing your own dose. Check the live venlafaxine status page →
Quetiapine: why abrupt stopping is especially risky
Quetiapine, prescribed for schizophrenia, bipolar disorder and off-label for sleep or anxiety augmentation, can cause rebound insomnia, nausea and, at higher psychiatric doses, symptom relapse if stopped suddenly. Switching between immediate-release and modified-release (XL) quetiapine is not a simple swap — the release profile differs, so any change needs prescriber input rather than a same-strength pharmacy substitution. Check the live quetiapine status page →
Venlafaxine 75mg immediate-release tablets are under an active DHSC supply notification until November 2026 (MSN/2026/040, checked 2 October 2026); other venlafaxine strengths and forms remain available, though several cannot cover extra demand. Quetiapine modified-release (XL) tablets are under an active DHSC supply notification (MSN/2025/006, checked 2 October 2026); immediate-release tablets remain available and can support extra demand. The advice above applies regardless: never stop either medicine without talking to your pharmacist or GP first.
Quick Status: All Mental Health Drugs
Recent Supply Issues
Fluoxetine (Prozac)
Fluoxetine 10mg, 30mg & 40mg capsules/tablets
No current official shortageHistoric SSPMediWatch's latest official data does not show active SSPs for fluoxetine. Historic SSPs affected 10mg, 30mg and 40mg presentations; the medicine page should be used for the live position.
Fluoxetine is the UK's most-prescribed SSRI, listed by NICE NG222 as a first-line antidepressant. There is no current fluoxetine shortage notice in MediWatch's official data (checked 15 October 2026). Historic fluoxetine SSPs under the DHSC SSP framework ran between 2019 and 2023 and have all expired.
Venlafaxine
Venlafaxine 75mg immediate-release tablets
Active shortage: Tier 2DHSC MSN/2026/040Out of stock until November 2026. DHSC issued this medicine supply notification on 26 August 2026. The 2025 shortage of 37.5mg modified-release tablets (SSP083, MSN/2025/035) is historic: the August 2026 notice lists those tablets as available.
Venlafaxine has a notably short half-life, meaning discontinuation symptoms can begin within hours of a missed dose. It is especially important not to miss doses or run out.
Quetiapine (Seroquel)
Quetiapine 50mg, 150mg, 200mg, 300mg & 400mg modified-release (XL) tablets
Active — Tier 2DHSC MSN/2025/006DHSC's medicine supply notification MSN/2025/006 (issued 10 February 2025) reports supply constraints on quetiapine 50mg, 150mg, 200mg, 300mg and 400mg modified-release tablets. Community Pharmacy England updated the supply summary on 13 August 2026; the latest resupply detail sits on the SPS Medicines Supply Tool. Checked 2 October 2026. The older 2024 SSPs for 150mg, 200mg and 300mg immediate-release tablets have expired.
Switching between IR and MR (XL) quetiapine is not straightforward — any switch must be managed by your prescriber. The total daily dose may need adjusting.
Drugs NOT Currently in Shortage
Good news: Sertraline, citalopram, escitalopram, mirtazapine and lithium have no active DHSC notice or Serious Shortage Protocol in MediWatch's official data (checked 15 October 2026).
Understanding Mental Health Drug Classes
- SSRIs (fluoxetine, sertraline, citalopram, escitalopram) — first-line for depression and anxiety per NICE NG222 and the BNF antidepressant summary. Increase serotonin levels.
- SNRIs (venlafaxine, duloxetine) — affect both serotonin and noradrenaline. Venlafaxine has a short half-life.
- Atypical antipsychotics (quetiapine, olanzapine, aripiprazole) — for schizophrenia, bipolar disorder, and treatment-resistant depression.
- Mood stabilisers (lithium, valproate) — primarily for bipolar disorder. Require blood monitoring.
What to Do If Your Mental Health Medication Is Affected
- Do not stop or reduce your dose without medical advice.
- Contact your pharmacy immediately. There is no Serious Shortage Protocol for any mental health medicine (NHSBSA, checked 17 October 2026), so a different strength or formulation needs your prescriber.
- Call multiple pharmacies. Stock levels vary.
- Contact your GP the same day if no alternative is available.
- Check if a different formulation works. Tablets vs capsules, IR vs MR, or liquid formulations may be available.
- Keep a 2-week buffer. Order repeat prescriptions before your supply runs out.
Support in Crisis
- Samaritans: 116 123 (free, 24 hours) — samaritans.org
- NHS 111: Call 111 for urgent medical advice
- Mind: 0300 123 3393 — mind.org.uk
- Crisis text line: Text SHOUT to 85258
Further Reading
- Mental health medication availability — full analysis
- What to do when your prescription is out of stock
- Antidepressant shortage page — SSRIs and SNRIs
Related Condition Pages
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