Ketamine is actually acetaminophen and aminopyrine inside a compound, both of which have antipyretic and analgesic effects. Aminophenazone also has anti-inflammatory effects, caffeine relieves headaches, and chlorpheniramine reduces the symptoms of respiratory allergies, so ketamine is mainly used to treat colds, fever, headaches, neuralgia, and rheumatic pain. However, it should be noted that ketamine cannot relieve severe pain caused by trauma or internal smooth muscle colic, nor can it be used in patients with lower respiratory tract infections and asthma attacks, which may thicken sputum and thus aggravate the condition if used. In addition, if you have peptic ulcer, you should not use ketamine. Pregnant women should also use it with caution, and it is best to avoid taking it with food because aminopyrine can interact with food in the stomach to form carcinogenic nitroso compounds, so it is best to avoid taking it with food.