Compazine is a brand name for a phenothiazine derivative used to treat severe nausea and vomiting. Its active ingredient prochlorperazine works by blocking dopamine receptors in the chemoreceptor trigger zone and the gastrointestinal tract. By antagonizing d2 receptors it reduces signals that initiate the vomiting reflex. This inhibition also produces an antiemetic effect by calming the area postrema in the brain. The drug additionally exerts mild sedative activity through central histamine h1 receptor blockade. These combined actions help restore normal gastrointestinal motility and reduce the perception of nausea. Clinically it is prescribed for patients whose nausea and vomiting are refractory to other therapies.

Compazine is a medication used to treat severe nausea and vomiting. It belongs to a class of drugs called phenothiazines. It works by blocking dopamine receptors in the brain to reduce signals that trigger nausea. This blockade helps control the vomiting center in the medulla. The drug has sedating and antiemetic properties that enhance its therapeutic effect. Its chemical structure allows it to cross the blood-brain barrier efficiently. Compazine modulates neurotransmitter activity to achieve its clinical benefit.

Compazine may cause drowsiness or dizziness in some patients. It can also lead to dry mouth or constipation. Some individuals experience blurred vision or ringing in the ears. Rarely it may result in low blood pressure or irregular heartbeat. Gastrointestinal upset such as nausea or loss of appetite has been reported. These effects are generally mild and temporary.

Compazine may cause drowsiness or fatigue in some patients. It can lead to dizziness or lightheadedness especially when standing up quickly. Some individuals experience dry mouth or throat irritation. Constipation is a reported gastrointestinal side effect. Blurred vision or sensitivity to light may occur in certain cases. Low blood pressure has been observed after dosing. Rarely, extrapyramidal symptoms such as trembling or muscle stiffness may appear. These effects are typically mild to moderate but should be monitored.