Call your doctor at once if you have a serious side effect such as: feeling short of breath (even with mild exertion), fever, chills, cough, chest pain, yellowing of the skin or eyes; pale skin, unusual weakness, numbness or tingling, or diarrhea that is watery or bloody.
Avoid using antacids without your doctor’s advice. Use only the specific type of antacid your doctor recommends. Antacids contain different medicines and some types can make it harder for your body to absorb nitrofurantoin.
Take this medication for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Nitrofurantoin will not treat a viral infection such as the common cold or flu.
Take nitrofurantoin with food or milk.