Q1: Is it possible to take this without food?
No, take with meals to prevent stomach upset.
Q2: Does it work with viral infection such as flu?
Only in case of bacterial infections.
Q3: Is it capable of causing loose stools?
Yes, because of impact on gut flora.
Q4: Is it safe during pregnancy?
Usually safe, ask doctor.
Q5: Is it possible to take alcohol with it?
Should be avoided, since it enhances side effects.