Sildenafil, bụ ọgwụ na-ewu ewu nke a na-eji na-agwọ ọrịa nrụrụ erectile na ụmụ nwoke. Ma kedu ihe bụ sildenafil na olee otu o si arụ ọrụ? Ka anyị nyochaa sayensị n'azụ ọgwụ mgbanwe a.