Domperidone
Motilium, Motilak, Motinorm, Domstal, Domet, Passazhix
Forms: Tablets, fast-dissolving tablets, suspension and suppositories; not marketed in the US.
Anti-sickness drug that blocks dopamine receptors in the gut and the brain's vomiting trigger zone while barely entering the brain. Restricted over heart-rhythm risk; not approved in the US.
Legal status: Prescription or over the counter depending on the country; not approved in the US; not on the WADA Prohibited List.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Used for nausea and vomiting, including on GLP-1 drugs, where an expert consensus prefers it to metoclopramide. For nausea in sport, antiemetics lack randomized trials. Medical use: short-term relief of nausea and vomiting only (EMA restriction, 2014).
What people seek and what studies show
Eases nausea and vomiting and speeds stomach emptying; unlike metoclopramide it rarely causes movement side effects (review). EMA found evidence for other uses extremely limited and dropped bloating and heartburn. No studies in athletes; sports reviews mention antiemetics for race nausea only from anecdote.
Effects
Evidence: Approved medicine — studied in people for its medical use
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
4 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 4 of 4 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. No measure removes a risk completely. Prescription medicines are listed only for a doctor to decide on, after tests — they have side effects of their own.
Limit caffeine, pre-workouts and other stimulants; with palpitations, stop the suspected drug, pause hard training and get an ECG. Don’t add potassium on your own (supplements, Asparkam/Panangin, salt substitutes): it is dangerous with spironolactone, ARBs/ACE inhibitors or kidney problems; a blood test shows the level.
How each option helps (14)
- Heart screening: ECG and echocardiogram — An ECG read by athlete criteria separates normal training changes from arrhythmias, conduction or QT problems — key with stimulants, clenbuterol, thyroid hormone or diuretics.
- Working with a doctor — Orders an ECG and tests for potassium, magnesium and thyroid hormones, and reviews stimulants and diuretics — the usual causes of palpitations in a stack.
- Regular blood tests — Shows potassium, magnesium and thyroid hormone levels — common causes of palpitations with diuretics, spironolactone or thyroid hormone; an ECG is still needed.
- Magnesium — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium aspartate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium chloride — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium gluconate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium glycinate (bisglycinate) — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium L-threonate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium lactate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium malate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium orotate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Magnesium taurate — In one small trial magnesium eased skipped beats in people with healthy hearts; low magnesium (diuretics, heavy sweating) is a known cause. Palpitations still need an ECG.
- Nebivolol — A doctor may use it to slow a fast heart rate; it does not remove the cause (stimulants, clenbuterol, thyroid hormone, low potassium) and can lower exercise capacity. Has side effects of its own.
Test prolactin if libido drops; a doctor decides on correction.
How each option helps (2)
- Regular blood tests — Prolactin testing matters with 19-nor compounds and helps explain low libido or nipple discharge.
- Working with a doctor — A doctor tests prolactin when libido or erections drop on nandrolone or trenbolone and decides whether treatment is needed; some symptoms come from the steroid itself, not prolactin.
React early: see a doctor at the first lump, check estradiol and prolactin.
How each option helps (3)
- Gynecomastia surgery — Removes formed gland tissue, but not the cause: steroid users needed repeat surgery more often in one series. Bleeding under the skin (hematoma) was the main complication in the largest series.
- Working with a doctor — Early assessment of breast-tissue growth allows treatment before the change becomes permanent.
- Regular blood tests — Estradiol and prolactin tests show what drives a tender lump, so a doctor can act while the tissue is still fresh; the tests alone change nothing.
Low-level side effects
How each option helps (13)
- Avoiding alcohol and other liver stressors — Alcohol irritates the stomach, adds to aspirin-related stomach bleeding and is a main cause of pancreatitis; avoiding it lowers that part of the risk, not drug nausea.
- Fluid & electrolyte management — Dehydration makes gut complaints in long or hot sessions more likely; drinking enough helps that part, not nausea from drugs or pancreatitis.
- Working with a doctor — Assesses persistent vomiting or severe belly pain (possible pancreatitis or gallstones), can add stomach protection to aspirin and adjusts GLP-1 treatment when nausea persists.
- Omeprazole and other proton-pump inhibitors (PPIs) — A doctor may consider it for heartburn, reflux, dyspepsia or ulcer cover with aspirin or NSAIDs (label, guidelines). It does little for nausea or diarrhea; long-term use has its own risks.
- Famotidine (H2 blockers) — Relieves and prevents occasional heartburn (label); it does not help nausea or diarrhea. For reflux damage or long-term ulcer cover a doctor usually turns to a PPI.
- Macrogol (polyethylene glycol laxative) — Eases constipation, including on GLP-1 drugs, with strong guideline backing in chronic constipation; not for nausea or heartburn. Rectal bleeding or worsening pain needs a doctor.
- Magnesium carbonate — An antacid for heartburn and indigestion (label), often combined with other antacids; it does not help nausea and may itself loosen stools. Not with weak kidneys.
- Magnesium citrate — In larger amounts a saline laxative for occasional constipation (label); not for nausea. It causes cramps and loose stools itself; ask a doctor first with kidney disease.
- Magnesium hydroxide — Labeled as an antacid for heartburn and a laxative for occasional constipation; short-term relief only, not for nausea. It can itself cause diarrhea; not with weak kidneys.
- Magnesium oxide — An osmotic laxative that eases constipation (conditional guideline advice); not for nausea or heartburn. It loosens stools itself; with weak kidneys blood magnesium can rise.
- Pancreatin + dimeticone (Pankreoflat) — Registered for heaviness and bloating after meals; it does not ease drug nausea, heartburn or aspirin stomach pain. Not with pork or cow's milk protein allergy or acute pancreatitis.
- Probiotics — May ease diarrhea, for example on GLP-1 drugs (consensus); in sport studies they mostly did not reduce exercise gut symptoms. Not for nausea or heartburn.
- Psyllium husk fiber — Soluble fiber eases constipation, including on GLP-1 drugs, and can firm loose stools; it does not help nausea or heartburn and can itself cause bloating and gas.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with a sports physician.
Which doctors can help
Get medical help at once if
- Racing or irregular heartbeat that does not settle at rest, dizziness, fainting (especially during exercise), chest pain — call your local emergency number.
- A painful lump under the nipple or nipple discharge — see a doctor early, while it can still regress; a hard, painless or fixed lump, skin dimpling or bloody discharge — see a doctor promptly.
In an emergency, call your local emergency number.
For women
Sometimes used off-label to increase breast-milk supply; mothers with heart-rhythm problems should not use it, and products bought online may be of unknown quality (LactMed).
Myth & fact
“Domperidone is a harmless stomach pill from the pharmacy.”
In 2014 European regulators restricted it to short-term nausea and vomiting after linking it to QT prolongation, serious arrhythmias and sudden cardiac death; it is ruled out with heart disease or QT-prolonging drugs.
Combinations
Domperidone itself can prolong the QT interval and has been linked to serious ventricular arrhythmias and sudden cardiac death. European regulators contraindicate it with other QT-prolonging medicines, toremifene among them; GnRH agonists such as triptorelin also carry a QT warning. Fainting, a seizure or a fast, irregular heartbeat needs emergency care.
ToremifeneTriptorelinDomperidone can prolong the QT interval, and in the European safety review a significant number of serious heart cases involved potassium-wasting diuretics. Loop and thiazide diuretics, clenbuterol and salbutamol lower potassium, which makes a dangerous rhythm disturbance more likely, more so with dehydration or heavy sweating.
FurosemideHydrochlorothiazideClenbuterolSalbutamolDomperidone blocks the dopamine receptors that keep prolactin in check and raised prolactin several-fold in trials, while cabergoline and bromocriptine lower prolactin by stimulating those same receptors. The two work against each other, and a prolactin test taken on domperidone is hard to interpret.
Loperamide has caused QT prolongation and fatal arrhythmias above label amounts, and fainting or ventricular tachycardia has been reported even within them, some in people on other drugs. Its label says to avoid other QT-prolonging drugs (domperidone and toremifene are such drugs) and names electrolyte disturbances, common with diarrhea, as a risk factor.
LoperamideToremifeneTriptorelinSources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
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