CAS NO: 99614-02-5, Ondansetron. Shodhana is considered to be one of the most dynamic Apis and Intermediates manufacturing companies. It works by blocking a substance called serotonin in the brain that causes nausea and vomiting. CAS NO: 99614-02-5 – Ondansetron is available in the form of tablets, injections, syrup, films, oral drops and solutions. The dosage will be decided by the doctor based on the patient’s condition.