壯陽藥有「按需使用」與「每日服用」兩種主要模式。按需型如威而鋼、犀利士20mg,適合在性行為前30至60分鐘服用;每日型如犀利士5mg則需每天固定時間服用,維持血中穩定濃度。前者適合性生活頻率低、不固定者,後者則適合有穩定伴侶、經常性需求的男性。兩者效果不同,選擇時應由醫師評估生活型態與健康條件,量身選配最適方案。
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