I had a bad headache, so I took an Alka-Seltzer to relieve it.

Alka-Seltzer 是一个复合名词，由 Alka（来自alkaline，碱性的）和 Seltzer（来自德国矿泉水品牌Selters）组成，指一种含有阿司匹林和碳酸氢钠的泡腾片药物，用于缓解头痛、胃痛等症状。