Antipsychotics and surgery: what to tell your team

Most patients on antipsychotics will have surgery at some point — a hernia repair, a hip replacement, a gallbladder, dental work under sedation. The interaction between antipsychotic medication and the operating room is not dramatic in most cases, but it does have to be planned. The wrong move — usually missing several doses around the surgery and not telling the anesthesia team — can produce avoidable problems on both sides.

Why this matters

Three categories of risk are at play when antipsychotics meet surgery:

• Pharmacological: antipsychotics can affect blood pressure, heart rhythm, sedation, and seizure threshold — all of which interact with anesthetic agents
• Psychiatric: abrupt discontinuation around surgery can trigger withdrawal symptoms or destabilize an otherwise well-controlled illness
• Communication: if the anesthesia team does not know what you are on, dose adjustments and monitoring decisions are made in the dark

What anesthesia teams need to know

Before any surgery — even outpatient procedures with sedation — bring a complete medication list. The American Society of Anesthesiologists emphasizes pre-operative medication reconciliation as a standard of care. For psychiatric medications specifically, the team needs:

• The exact name and dose of each antipsychotic
• How long you have been taking it
• The schedule (morning, evening, twice daily)
• The date of your last long-acting injection if applicable
• Any other psychiatric medications (antidepressants, mood stabilizers, anxiolytics, sleep aids)
• Recent ECG results if available — particularly relevant for QT-prolonging agents
• Your psychiatrist's name and contact

Pharmacological interactions worth knowing

QT prolongation

Many antipsychotics — ziprasidone, haloperidol, pimozide, thioridazine — prolong the QT interval. Several anesthetic agents and ondansetron (a common anti-nausea medication used in anesthesia) also prolong QT. The combination can stack. The anesthesia team will usually order or review an ECG and may choose alternative agents. See our QT article.

Blood pressure and orthostatic hypotension

Antipsychotics with strong alpha-1 blockade (chlorpromazine, quetiapine, olanzapine) can lower blood pressure. Combined with anesthetic-induced vasodilation, this can produce more dramatic drops in pressure during induction. Anesthesiologists routinely manage this with fluids and pressors but appreciate the heads-up.

Sedation

Antipsychotics with strong sedating effects can extend recovery from anesthesia. Plan for a slightly longer post-op observation if you are on a sedating regimen.

Seizure threshold

Clozapine and chlorpromazine lower seizure threshold modestly. The team should be aware, particularly for procedures involving general anesthesia or for patients with prior seizures.

Anticholinergic burden

Olanzapine, clozapine, quetiapine, and chlorpromazine have anticholinergic activity. Combined with surgical anticholinergics (glycopyrrolate, atropine) and post-op opioids, the cumulative burden can produce ileus, urinary retention, dry mouth, or post-op delirium — particularly in older patients.

Should you continue or hold the antipsychotic?

For the vast majority of patients, antipsychotics should be continued through the perioperative period. Stopping abruptly carries withdrawal and relapse risk that usually outweighs any anesthetic benefit. Specifically:

• Take your usual oral dose on the morning of surgery with a small sip of water unless told otherwise (NPO rules generally allow this)
• Long-acting injections should usually be administered on schedule; if a dose is due close to surgery, your psychiatrist and surgeon can coordinate the timing
• Clozapine requires more careful planning — extended NPO, prolonged ileus, or post-op infection can affect both blood counts and clozapine levels; communicate early with your prescriber
• Lithium is sometimes held 24–72 hours pre-op for major surgery because of fluid shifts; this is a separate decision involving the psychiatrist

NPO and the missed dose

Surgical NPO orders ("nothing by mouth") are usually 6–8 hours for solids and 2 hours for clear liquids. For most antipsychotics, taking the morning dose with a small sip of water at the usual time is acceptable. Confirm with your surgical team beforehand. If a dose is going to be missed:

• Tell the anesthesia team — they may want to add or substitute medication during the case
• Resume the medication as soon as you are tolerating oral intake post-op
• Do not double up to "catch up" — this can produce side effects without benefit

Post-op considerations

• Pain medication interactions: opioids combined with antipsychotics increase sedation and respiratory depression risk; the post-op team will adjust
• Nausea management: some anti-nausea drugs (haloperidol, droperidol, prochlorperazine) are themselves dopamine blockers and can stack with your antipsychotic
• Delirium risk: particularly in older patients, post-op delirium can be confused with relapse; psychiatric input often helps
• Restart of long-acting injections: if a dose was delayed, your psychiatrist will plan the catch-up

A pre-op checklist

1. Tell your psychiatrist about the planned surgery as soon as it is scheduled
2. Ask your psychiatrist to send a brief medication summary to your surgical team
3. Bring a written or printed medication list to every pre-op visit
4. Confirm the morning-of-surgery medication plan with both the surgeon and anesthesia team
5. Ask about post-op psychiatric medication restart instructions
6. Identify someone who can bring your medications to the hospital and reach your psychiatrist if needed

The big picture

Surgery is a manageable event for someone on antipsychotics. The single most important thing is communication — your surgical team, anesthesiologist, and psychiatrist should all know what you are on and what the plan is. With that in place, the medication continues, the surgery happens, and recovery proceeds without psychiatric destabilization. The horror story is the patient who quietly stopped their medication a week before surgery to "be safe" and ended up in psychiatric crisis the week after.

For more, see managing antipsychotics during illness, QT prolongation, and orthostatic hypotension.

This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.