What Causes Weakness In Leg After Taking Ascoril?

I have a touch of the flu and was prescribed ascoril, I noticed that my legs are week and I have an empty feeling in my stomach, I am not sure if this is a side effect from the ascoril or symptoms of the flu. I have been taking the ascoril for two days and I continue to have the dry cough and slight rattling sound in my throat. Should I stop taking the ascoril