A method of treating rhinitis and rhinorrhea includes taking a daytime oral dosage unit containing a non-sedating antihistamine for treating rhinitis and an anticholinergic agent having limited capacity to cross blood-brain barrier for treating rhinorrhea, and taking a nighttime oral dosage unit containing a non-sedating anticholinergic agent that has limited capacity to cross blood-brain barrier and that is in a lower amount than the amount in the daytime oral dosage unit for treating rhinorrhea or no anticholinergic agent. A treatment regimen for rhinitis with rhinorrhea includes a daytime oral dosage unit containing a non-sedating antihistamine for treating rhinitis and an anticholinergic agent having limited capacity to cross blood-brain barrier for treating rhinorrhea, and a nighttime dosage unit containing a non-sedating anticholinergic agent that has limited capacity to cross blood-brain barrier and that is in a lower amount than the amount in the daytime oral dosage unit for treating rhinorrhea or no anticholinergic agent.
