Alka-Seltzer
/ˌalkəˈsɛltsə/ /ˈalkəˌsɛltsə/noun
A trademark for: an aspirin-based remedy for headache, heartburn, upset stomach, etc., which is taken as a drink in water, in which it dissolves with effervescence. Also figurative (frequently attributive).
Origin
1930s; earliest use found in The Oakland Tribune. From alka- + seltzer.