Labetalol hydrochloride injection is usually well tolerated. Most adverse effects have been mild and transient. Symptomatic postural hypotension is likely to occur if patients are tilted or allowed to assume the upright position within 3 hours of receiving Labetalol hydrochloride Injection.
The following also were reported with Labetalol hydrochloride injection: Cardiovascular System: Ventricular arrhythmia.
Central and Peripheral Nervous System: Dizziness, tingling of the scalp/skin, hypoesthesia (numbness) and vertigo.
Gastrointestinal System: Nausea, vomiting, dyspepsia and taste distortion.
Metabolic Disorders: Transient increases in blood urea nitrogen and serum creatinine levels; these were associated with drops in blood pressure, generally in patients with prior renal insufficiency.
Psychiatric Disorders: Somnolence/yawning.
Respiratory System: Wheezing.
In addition, a number of other less common adverse events have been reported: Cardiovascular: Hypotension, and rarely, syncope, bradycardia, heart block.
Liver and Biliary System: Hepatic necrosis, hepatitis, cholestatic jaundice, elevated liver function tests.
Hypersensitivity: Rare reports of hypersensitivity (e.g, rash, urticaria, pruritus, angioedema, dyspnea) and anaphylactoid reactions.