Labetalol (Intravenous 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 or nurse immediately if any of the following side effects occur:

• Dizziness
• Tingling of the scalp or skin

• Abdominal or stomach pain
• Black, tarry stools
• Blurred vision
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Chills
• Clay-colored stools
• Confusion
• Dark urine
• Diarrhea
• Dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
• Fast, pounding, or irregular heartbeat or pulse
• Feeling of constant movement of self or surroundings
• Fever
• General tiredness and weakness
• Headache
• Itching skin
• Light-colored stools
• Loss of appetite
• Nausea and vomiting
• Palpitations
• Sensation of spinning
• Skin rash
• Sweating
• Unpleasant breath odor
• Unusual tiredness or weakness
• Vomiting of blood
• Wheezing
• Yellow eyes or skin

• Chest pain or discomfort
• Cough
• Difficult or labored breathing
• Difficulty swallowing
• Hives or welts
• Hoarseness
• Irritation
• Joint pain, stiffness, or swelling
• Large, hive-like swelling on face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• Lightheadedness, dizziness, or fainting
• Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• Redness of skin
• Shortness of breath
• Slow heartbeat
• Swelling of eyelids, face, lips, hands, or feet
• Tightness in chest
• Troubled breathing or swallowing

Get emergency help immediately if any of the following symptoms of overdose occur:

• Convulsions
• Dilated neck veins
• Extreme fatigue
• Irregular breathing
• Loss of bladder control
• Muscle spasm or jerking of all extremities
• Noisy breathing
• Sudden loss of consciousness
• Weight gain

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:

• Stuffy nose

• Acid or sour stomach
• Belching
• Change in taste or bad, unusual, or unpleasant (after) taste
• Decreased interest in sexual intercourse
• Heartburn
• Inability to have or keep an erection
• Increased yawning
• Indigestion
• Loss in sexual ability, desire, drive, or performance
• Sleepiness or unusual drowsiness
• Stomach discomfort or upset
• Vomiting

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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