A putative class action in federal court in Newark alleges the maker of Excedrin Migraine is duping customers by charging a higher price for a medicine identical to a lower-priced line.

Novartis Corp., of East Hanover, N.J., sells Excedrin Migraine at a wholesale price of $3.60 for 24 tablets, which is 12.5 percent more than for its $3.20 priced Excedrin Extra Strength.