Common side effects from ranitidine:

headache (may be severe)
decreased sex drive, impotence
swollen or tender breasts (in men)
nausea, vomiting, stomach pain
diarrhea or constipation
 

Tell your doctor if any of these symptoms are severe or do not go away:

headache
constipation
diarrhea
upset stomach
vomiting
stomach pain
 

If you experience any of the following symptoms, call your doctor immediately:

allergic reaction (hives, difficulty breathing, swelling of your face, lips, tongue or throat)

 

Ranitidine may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

 

FDA Information

Why is this medication prescribed?

Other uses for this medicine

Dosage and using this medicine

What special precautions should I follow?

What should I do if I forget a dose?

What storage conditions are needed for this medicine?

In case of an emergency/overdose