在英语中，“买药”可以翻译为“buy medication”或“purchase medication”。
“内裤”可以翻译为“underwear”，它也可以称作“panties”或“knickers”，但这两个词并不是很常用。
下面是一些使用这些词的英文例句：
I need to buy some medication for my headache.
(我需要买点药来治我的头疼。)
I need to purchase some allergy medication before the pollen season starts.
(我需要在花粉季节开始之前买些过敏药。)
I always forget to buy new underwear, so I end up wearing the same pair for weeks.
(我总是忘记买新内裤，所以我最后穿了几周一样的内裤。)
I need to go to the store and buy some new underwear.
(我需要去商店买些新内裤。)