Methods of treating drug side-effects including gastrointestinal spasms are provided, such methods not requiring the use of systemic drugs that have shown to (i) provide slow relief, (ii) cause adverse side effects, (iii) limit activities, (iv) worsen existing gastrointestinal conditions, (v) be unrecommended in several gastrointestinal conditions that include gastrointestinal spasms, or (vi) be unrecommended in the absence of diarrhea.