Ritonavir (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Fainting
• Feeling faint, dizzy, or lightheaded
• Feeling of warmth or heat
• Flushing or redness of the skin, especially on the face and neck
• Headache
• Sweating

• Confusion
• Dehydration
• Dry or itchy skin
• Fruity mouth odor
• Increased hunger
• Increased thirst
• Increased urination
• Nausea
• Vomiting
• Weight loss

• Bloating
• Chills
• Constipation
• Convulsions
• Cough
• Darkened urine
• Decreased urination
• Difficulty with breathing
• Dry mouth
• Fast heartbeat
• Fever
• Hives or welts
• Increase in heart rate
• Indigestion
• Itching
• Large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• Loss of appetite
• Loss of bladder control
• Muscle spasm or jerking of all extremities
• Noisy breathing
• Pains in the stomach, side, or abdomen, possibly radiating to the back
• Rapid breathing
• Redness of the skin
• Shortness of breath
• Skin rash
• Sudden loss of consciousness
• Sunken eyes
• Thirst
• Tightness in the chest
• Unusual tiredness or weakness
• Wheezing
• Wrinkled skin
• Yellow eyes or skin

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Acid or sour stomach
• Belching
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Change in sense of taste
• Diarrhea
• Dizziness
• General feeling of discomfort or illness
• Heartburn
• Lack or loss of strength
• Sleepiness or unusual drowsiness
• Sleeplessness
• Trouble sleeping
• Unable to sleep
• Weakness

• Body aches or pain
• Congestion
• Delusions
• Dementia
• Difficulty with moving
• Discouragement
• Dryness or soreness of the throat
• Excess air or gas in the stomach or intestines
• Fear
• Feeling sad or empty
• Full feeling
• Hoarseness
• Increased urge to urinate during the night
• Irritability
• Lack of appetite
• Loss of interest or pleasure
• Mood or mental changes
• Muscle pain or stiffness
• Nervousness
• Pain in the joints or in unspecified location
• Passing gas
• Runny nose
• Tender, swollen glands in the neck
• Throat irritation
• Tiredness
• Trouble concentrating
• Trouble with swallowing
• Voice changes
• Waking to urinate at night

• Gaining weight around your neck, upper back, breast, face, or waist

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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