ODAT, I found these side effects on WebMD. I've had doctors tell me that all medications carry some side effects. Well no shit. They should tell us what to look for.
Nausea, vomiting, diarrhea, lightheadedness, dizziness, unsteadiness, drowsiness, mouth sores, or cough may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious side effects occur: sunburn (sun sensitivity), muscle pain, difficult or painful swallowing, change in the amount of urine, pink urine, brown/gray tooth discoloration, blue/gray/brown discoloration of the skin/lips/tongue/gums, numbness/tingling of the hands/feet, unusual fatigue, new signs of infection (e.g., fever, chills, persistent sore throat).
Tell your doctor immediately if any of these rare but very serious side effects occur: hearing changes (e.g., ringing in the ears, decreased hearing), easy bruising/bleeding, headache, vision changes (e.g., blurred vision).
This medication may rarely cause a severe intestinal condition (pseudomembranous colitis) due to a resistant bacteria. This condition may occur while receiving therapy or even weeks after treatment has stopped. Do not use anti-diarrhea products or narcotic pain medications if you have the following symptoms because these products may make them worse. Tell your doctor immediately if you develop persistent diarrhea, abdominal or stomach pain/cramping, or blood/mucus in your stool.
Use of this medication for prolonged or repeated periods may result in oral thrush or a new yeast infection (oral or vaginal fungal infection). Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge or other new symptoms.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, skin lesions/sores, itching, swelling, severe dizziness, trouble breathing, new or worsening swelling/pain in the joints, swollen glands, chest pain, fast/irregular heartbeat, severe stomach/abdominal pain, yellowing eyes/skin, dark urine.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.