Domperidone
Domperidone is a prokinetic and anti-nausea drug that blocks dopamine receptors in the gut wall and in the chemoreceptor trigger zone, the part of the brainstem that sits outside the blood-brain barrier. The result is faster stomach emptying and a suppressed vomiting reflex. It is used for nausea and for sluggish digestion with fullness and bloating.
It is taken before meals on an empty stomach, since it works by moving food along and needs to be acting already while the meal is being emptied; food taken first delays its absorption. It can prolong the QT interval, the heart's electrical recovery time, so it is meant for short courses and combines badly with other QT-prolonging drugs and with medicines that slow its breakdown in the liver, such as certain antifungals and antibiotics. Any existing heart rhythm problem or potassium or magnesium disturbance makes it a poorer choice.
Palpitations, fainting, dizziness, an irregular heartbeat, or nausea that persists past a short course are reasons to see a doctor.
Reference information, not medical advice. Discuss any change with your doctor.