Pharma major Pfizer Ltd registered net profit of Rs 48.10 crore in the quarter ended March 2012 as against Rs 63.14 crore during the four-month period ended March 2011, the company said on Monday. Its sales stood at Rs 251.7 crore in the quarter ended March 2012 as against Rs 293 crore during the four-month period ended March 2011, Pfizer said in its communiqué to BSE .