Pitofenone (CAS 54063-52-4) is a key pharmaceutical intermediate and active pharmaceutical ingredient (API) primarily used in the synthesis of antispasmodic and analgesic drugs. It acts as a smooth muscle relaxant, targeting gastrointestinal, biliary, and urinary tract spasms, making it widely used in formulations for abdominal pain, renal colic, and dysmenorrhea. As a critical component in combination analgesics (e.g., with metamizole sodium), it enhances pain relief by reducing muscle spasms. Beyond clinical use, it serves as a reference standard for HPLC/LC-MS quality control in pharmaceutical manufacturing. It is also utilized in pharmacological research to study smooth muscle function and drug-receptor interactions, supporting the development of novel antispasmodic therapeutics.

GHS Classification: Skin Irritation (Category 2), Eye Irritation (Category 2A), Specific Target Organ Toxicity (Single Exposure, Category 3) Hazards: Causes skin irritation; causes serious eye irritation; may cause respiratory irritation (H315, H319, H335). No severe acute toxicity data, but high oral doses may cause mild gastrointestinal upset (nausea, diarrhea). Prolonged skin contact may trigger allergic reactions.

Handling: Use in a fume hood; wear nitrile gloves, safety goggles, and lab coat. Avoid dust inhalation, skin/eye contact, and ingestion. Ensure workplace ventilation.

First Aid: Skin—rinse with soap and water for 15 min; remove contaminated clothing. Eyes—flush with water for 15 min; seek medical help if irritation persists. Inhalation—move to fresh air; consult a doctor if breathing issues arise. Ingestion—rinse mouth; do not induce vomiting; get medical attention.

Storage & Disposal: Store sealed at 2–8 °C, protected from light. Dispose as hazardous waste per local regulations; avoid environmental release.