I've been on Zyrtec for roughly 3 months now, and I out of the blue started sweating profusely from my arm-pits. I'm 20 years old, past the sweaty portion of puberty, and I've never sweated so much in my entire life. Even when I'm completely inactive I soak my shirt through.
Also, I've been feeling rather depressed lately, my once happy outlook on life has turned 100% bitter and cynical.