I found a generic brand that's a copy of the cough only version of robitussin... only it's 4 ounce bottles so I gotta pay more . Oh well.

Would it be safe to mix the robitussin with the generic brand so I didn't get as much pseudoephedrine (and didn't waste my money :P)? Like 1 ounce of robitussin to 4 ounces of the generic stuff...