발기 부전 치료에 주로 사용되는 약물로, 음경으로의 혈류를 증가시켜 발기 기능을 개선함.
A prescription drug (sildenafil) used primarily to treat erectile dysfunction (impotence) by increasing blood flow to the penis.
예문:
"The doctor prescribed Viagra to help manage the patient's symptoms of erectile dysfunction."
"Although effective, Viagra should only be taken under the guidance of a healthcare professional due to potential side effects."