Ive Been Taking Hysingla Er 40 Mg And My Feet,

Ive been taking hysingla er 40 mg and my feet, ankles and legs have been swelling . I have noticed a considerable amount of swelling on my face also.Also a considerate amount of weight gain. Could this be a simple allergic reaction or should
i get immediate emergency treatment for this matter? Concerned patient with other problems I've noticed lately. Please help!1