What type of therapeutic effect does a troche have compared to oral liquids?

A troche provides a better local effect in mucosal infections because it dissolves slowly in the mouth and releases its active ingredients directly onto the mucosal surfaces. This targeted delivery allows the medication to act locally where it is needed most, such as in the throat or oral cavity, leading to an effective treatment of infections in those areas.

In contrast, oral liquids are absorbed more systematically as they travel through the gastrointestinal tract, which might dilute their concentration in the local site of infection. As a result, the therapeutic effect can be less localized compared to the effect achieved with a troche.

While other options like rapid systemic effect, potential for side effects, and bioavailability are important considerations in pharmacology, they do not specifically address the advantage described in the context of a troche's use for mucosal infections. Thus, the emphasis on local efficacy in treating infections in tissues such as the oral mucosa makes this the correct answer.