Fig. (2) Performance frontier for viscosity and titratable acidty. Medicines 7 (Bactrim^® 200mg/5mL), 8 (Bactrim F^® 400mg/5mL) and 27 (Zinnat^® 250mg/5mL) presented low levels of titratable acidity, despite of their high titratable acidity. Klaricid^® 50mg/mL were distant from performance frontier again, because of their high levels of titratable acidity and sacarose concentration, presenting the worst performance.