<prompt> Dose of centchroman is ?30 mg60 mg120 mg240 mg  <response>: Ans. is a i.e., 30 mg Cetchroman Saheli Ormeloxifene, research product of Central Drug Research Institute, Lucknow, India. It is a potent non - steroidal compound with potent anti - estrogenic and weak estrogenic propeies. It is taken orally 30 mg twice a week for first three months then once a week. It works primarily by preventing implantation of feilized ovum. It does not inhibit ovulation. It is avoided in PCOD, with liver and kidney diseases and in tuberculosis. There may be a tendency of oligomenorrhoea. The failure rate is 1 - 4100 woman years of use. Failure rate is less with increased doses. It is devoid of any significant adverse metabolic effect. This may also be used as a emergency contraceptive. 