Chlorphen-12 is the only chlorpheniramine maleate that lasts 12 hours.
Chlorpheniramine has been the only medication giving me consistent relief from hay fever since my doctor first prescribed it.1 - John B
This is more effective than products like Allegra and Claritin, but without the grogginess side effects of Benadryl.1 - Doug J
This is the best antihistamine ever easily better by far over Allegra, Zyrtec, Claritin, Benadryl and others.1 - James M
