Motilium 10 mg: QT risk and milk in one letter, no invented US coupon

01Two risks share one 10 mg tablet

QT prolongation and milk excretion are the two reasons this postscript exists. Motilium is a peripheral D2 blocker that still sits on the chemoreceptor trigger zone. It is not a vitamin for supply. It is not a US pharmacy stock item.

Postmarketing rows include very rare QT prolongation and torsades de pointes, often with other risk factors. Epidemiology tied serious ventricular arrhythmia and sudden death to older age, daily doses above 30 mg, and QT-prolonging or CYP3A4-inhibiting partners.

Thorough QT work in healthy people at 10 and 20 mg four times daily did not push the 90% CI past 10 msec in the study the SmPC cites. Regulators still narrowed dose and duration in 2014 because real-world hearts were not that study.

02Milk is excreted. Milk is not the EU indication.

Breast-fed infants receive less than 0.1% of the maternal weight-adjusted dose. That is a transfer number, not a safety certificate. The SmPC says cardiac effects in the infant cannot be excluded. Decide whether to stop feeding or stop the drug, counting both benefits.

Caution if the infant already has QT-risk factors. A premature nursery is not the healthy-volunteer QT study. Off-label galactagogue use in some countries runs longer and sometimes higher than 30 mg/day. That pattern is exactly the epidemiology the 2014 cut tried to stop.

No regulator this desk cites has approved domperidone to treat low milk supply. Canadian off-label use does not become a Stockholm standing order. If lactation is the only goal, this tablet is the wrong letter.

03Hearts, salts, livers, and CYP3A4 partners stay off the list

Known long QTc, important electrolyte disturbance (low or high potassium, low magnesium), bradycardia, and heart failure are contraindications. So is moderate or severe hepatic impairment. Prolactinoma is a separate stop. So is a gut that must not be pushed (bleed, mechanical block, perforation).

QT-prolonging drugs are contraindicated, with a narrow apomorphine exception written for Parkinson's pathways. Potent CYP3A4 inhibitors are contraindicated whether or not they also prolong QT: the metabolism block can raise domperidone about threefold.

Moderate CYP3A4 inhibitors (diltiazem, verapamil, some macrolides) are 'not recommended.' Azithromycin and roxithromycin need caution. Clarithromycin is in the potent, contraindicated pile. Bring the whole blister-and-bottle bag to the visit.

04The 2014 week and the 30 mg ceiling

CMDh confirmed PRAC: keep the medicine for nausea and vomiting, cut the oral adult dose to 10 mg up to three times a day, and do not normally use it longer than one week. Suppositories at 30 mg twice daily exist in some member states. This note stays on the 10 mg tablet.

Lowest effective dose, shortest time. Take oral Motilium before meals; after food, absorption lags. A missed 10 mg is omitted. Doubling the next slot is forbidden in the SmPC.

Children under 12, and adolescents 12 or older who weigh under 35 kg, do not have established tablet efficacy in that SmPC. Do not 'just give half a 10 mg' from a kitchen knife.

05The breast-fed infant is not a tiny adult on 10 mg

Less than 0.1% transfer still leaves a cardiac caution. Premature infants, infants on other QT drugs, or infants with congenital long QT are the caution the SmPC names. A well-term baby is still not a license for a months-long galactagogue course.

Prolactin rise is a pharmacologic fact of D2 block. Using that rise as a lactation protocol outruns both the EU indication and the US warning. If a lactation consultant wrote 10 mg three times a day for six weeks, that is off-label duration and needs a prescriber who will also watch the mother's ECG risk.

Partners who split a leftover 10 mg 'so supply comes back after a night out' are improvising a cardiac drug. Stop. Feed, pump, or use a method a pediatrician actually named.

06When an ECG belongs on the same desk as the blister

Known long QT already forbids the tablet. A new faint, a new pounding, or a potassium wrecked by vomiting is a reason to stop and record a strip, not a reason to take the evening 10 mg 'to settle the stomach that the faint caused.'

Overdose language in the SmPC asks for ECG watch because QTc can stretch. Close observation is not a home project. Bring the time of the last tablet.

Electrolytes after a vomiting week are part of the cardiac file. Replacing only the Motilium without checking potassium is unfinished work.

Loop diuretics, licorice tea, and a three-day vomit all empty potassium. Any of those next to a 10 mg is a reason to measure, not a reason to add a second antiemetic from a different class without looking.

New macrolide for 'just-in-case sinus' mid-week is the classic Stockholm letter. Stop Motilium before the first clarithromycin if nausea is already easing. The interaction is the contraindication, not a dose-spacing trick.

Palpitations that start after grapefruit plus 10 mg are a CYP3A4 story in miniature. Grapefruit is not listed as a hard SmPC stop the way clarithromycin is, but it is a reason to stop experimenting and bring the list.

07No US fill, and this desk will not invent a coupon

FDA has not approved domperidone for any indication. The 2004 warning (still current) told breastfeeding women not to use imported Motilium to raise supply, citing arrhythmia, arrest, and sudden death in the old intravenous story, plus milk excretion with unknown infant risk.

Compounding pharmacies in the US are not a legal back door for this molecule as a galactagogue. Research programs for gut disease are a different, regulated path. 'I saw a US blog with a price' is not a source. We will not write a dollar figure to fill that hole.

Travelers who bought 10 mg in the EU should not mail leftover strips to a US address as a favor. Customs and cardiac risk are both real. The nausea-role postscript covers why the US counter is the wrong ask.

08A missed 10 mg is left blank

Scheduled time passed? Skip. Resume the usual slot. The SmPC is explicit: do not double. Doubling is how a 20 mg hour appears in a woman who was already near other QT drugs.

Renal impairment lengthens half-life on repeat dosing. Frequency may fall to once or twice daily, and the milligram may fall. That adjustment is a prescriber act, not a milk-supply hack.

Before-meal timing is absorption, not a cardiac antidote. Taking it after a fatty lunch only delays the peak. It does not cancel a clarithromycin interaction.

QT-and-milk pocket locks

• Adult lid: 10 mg up to three times, 30 mg in 24 hours
• Usual course: one week for nausea
• Missed tablet: omit, never double
• Milk goal alone: wrong indication
• US dollar or coupon: not written here

09The withdrawn intravenous story still sits under the oral warning

Older intravenous domperidone was pulled in several countries after arrhythmia, arrest, and sudden death reports. FDA's 2004 lactation warning leaned on that history even though the oral tablet was the product people were importing. The oral 10 mg is not that infusion. The warning still exists because milk use was driving unapproved import.

HERG-channel work in the SmPC puts in-vitro safety margins in the tens relative to free plasma after 10 mg three times daily. Those margins shrink when CYP3A4 is blocked and free levels can triple. That is the chemistry behind the clarithromycin stop, not a trivia line.

Parkinson clinics sometimes still meet the apomorphine exception. That exception is written because the alternative nausea path is ugly, not because QT vanished. Everyone else should treat QT-prolonging neighbors as a hard no.

Prolactinoma remains a stop even when the heart is perfect. A D2 blocker on a prolactin-secreting tumor is the wrong tool. Headache plus milk plus Motilium is a pituitary letter, not a QT letter, but it belongs in the same bag you bring to clinic.

Heart-failure clinics should treat Motilium as absent until a named cardiologist says otherwise. Congestive failure is already on the contraindication line. A 'tiny bit of nausea after the ACE inhibitor' is not a loophole. Pick another antiemetic that does not sit on that line. Write the substitute name in the chart.

10What cardiology and lactation both need on one page

List every QT partner, every CYP3A4 inhibitor, the last potassium, and whether anyone in the house is trying to lactate. Half of Motilium letters hide the milk goal behind 'a bit of nausea.'

The domperidone letter holds the full lock. This postscript only binds the 10 mg tablet to QT and milk. No invented US price belongs in either file.

11Seal on the QT-and-milk despatch

Nora Lindqvist seals this QT-and-milk note on 21 August 2026. Ten milligrams, three times, one week, nausea as the indication. Milk transfer is real and small. Infant cardiac risk is not dismissed. US fill does not exist here as a number.

Questions: [email protected]. Palpitations, syncope, or infant worry: stop and call, name Motilium.