Take cephalexin tablets or capsules by mouth. Swallow the tablets or capsules with a drink of water. You can take cephalexin with or without food. If cephalexin upsets your stomach it may help to take it with food. Take your doses at regular intervals. Do not take your medicine more often than directed. Finish the full course prescribed by your prescriber or health care professional even if you think your condition is better. Do not stop taking except on your prescriber's advice.