Although the taste is terrible, the effectiveness of Alka Seltzer cold medicine is amazing. It works well for me, especially with a stuffy head and that horrible achy feeling. It works really quickly for me, much more so than other cold medicines. Although I usually end up taking a nap after taking it. Congestion Relief Pretty much every time I take this medicine it's after I have taken something for days and have gotten no relief. Every time I am sick, my dad will tell me to take Alka Seltzer, so it is kinda a family thing for us too. I get really bad headaches when I have a cold and this seems to almost instantly get relief. Chest Congestion Relief I have asthma so nothing much helps me feel better on chest congestion. It seems to work a bit. I use it more for head congestion and relief of aches and pains. Relief of Aches & Pains Alka Seltzer seems to relieve aches and pains really quickly. I usually get really tired when I'm sick, so as soon as I relax a little from the aches and pains I have to take a nap. I don't think the medicine would make a normal person sleepy though. Cough Suppression Like I said earlier, I have pre-existing conditions that cause me to cough a lot when I'm sick.