Does Trandate (labetalol) cause side effects?
Nerves from the adrenergic nervous system travel from the spinal cord to the arteries where they release norepinephrine. Norepinephrine attaches to adrenergic receptors on arteries and causes the arteries to contract, narrowing the arteries, and increasing blood pressure.
Trandate blocks receptors of the adrenergic nervous system. When Trandate attaches to and blocks the receptors, arteries expand, resulting in a fall in blood pressure.
The brand name Trandate is discontinued; generic forms of labetalol are available.
Common side effects of Trandate include
- fluid retention (edema),
- shortness of breath, and rarely,
- postural hypotension (a rapid decrease in blood pressure when going from the lying or seated position to the standing position that may cause light-headedness or fainting).
Serious side effects of Trandate include
Drug interactions of Trandate include medications that lower blood sugar such as insulin or oral antidiabetic medications, because Trandate can mask early warning symptoms of hypoglycemia (low blood sugar) such as tremors and increased heart rate, which are the result of activation of the adrenergic nervous system.
If combined with adrenergic stimulating drugs used for treating asthma, for example, albuterol or pirbuterol, the adrenergic blocking effects of Trandate may counteract the effects of the stimulating drugs and reduce their effectiveness for treating asthmatic attacks. More of the adrenergic drug may be needed.
Glutethimide may decrease the effectiveness of Trandate by increasing its elimination. When both drugs are used together, more Trandate or less glutethimide may be needed.
Cimetidine may increase the effectiveness of Trandate by blocking its elimination and increasing its levels in the blood. Therefore, less Trandate may be needed when cimetidine and Trandate are used together.
Halothane anesthesia may contribute to the blood pressure lowering effects of Trandate.
There are no adequate studies of Trandate during pregnancy. Trandate is excreted in breast milk. It should be used cautiously in breastfeeding mothers because of the risk that the infant may develop a slow heart rate.
What are the important side effects of Trandate (labetalol)?
The most common side effects of labetalol are:
Postural hypotension (a rapid decrease in blood pressure when going from the lying or seated position to the standing position that may cause light-headedness or fainting) occurs rarely. Patients should be observed for this possible side effect within two to four hours of the first labetalol dose and after any changes in dose.
Other important side effects include:
- sexual dysfunction,
- abnormal heart rhythm,
- slow heart rate,
- liver failure, and
- allergic reactions.
Trandate (labetalol) side effects list for healthcare professionals
Most adverse effects are mild and transient and occur early in the course of treatment. In controlled clinical trials of 3 to 4 months' duration, discontinuation of Trandate (labetalol) Tablets due to one or more adverse effects was required in 7% of all patients.
In these same trials, other agents with solely beta-blocking activity used in the control groups led to discontinuation in 8% to 10% of patients, and a centrally acting alpha-agonist led to discontinuation in 30% of patients.
The incidence rates of adverse reactions listed in the following table were derived from multicenter, controlled clinical trials comparing labetalol HCl, placebo, metoprolol, and propranolol over treatment periods of 3 and 4 months. Where the frequency of adverse effects for labetalol HCl and placebo is similar, causal relationship is uncertain.
The rates are based on adverse reactions considered probably drug-related by the investigator. If all reports are considered, the rates are somewhat higher (e.g., dizziness, 20%; nausea, 14%; fatigue, 11%), but the overall conclusions are unchanged.
(n = 227)
(n = 98)
(n = 84)
(n = 49)
|Body as a whole|
|Central and peripheral nervous systems|
|Autonomic nervous system|
The adverse effects were reported spontaneously and are representative of the incidence of adverse effects that may be observed in a properly selected hypertensive patient population, i.e., a group excluding patients with bronchospastic disease, overt congestive heart failure, or other contraindications to beta-blocker therapy.
Clinical trials also included studies utilizing daily doses up to 2,400 mg in more severely hypertensive patients. Certain of the side effects increased with increasing dose, as shown in the following table that depicts the entire US therapeutic trials data base for adverse reactions that are clearly or possibly dose related.
|Labetalol HCl Daily Dose (mg)||200||300||400||600||800||900||1,200||1,600||2,400|
|Number of patients||522||181||606||608||503||117||411||242||175|
|Vomiting||0||0||< 1||< 1||< 1||0||1||2||3|
In addition, a number of other less common adverse events have been reported:
Body as a Whole: Fever.
Central and Peripheral Nervous Systems: Paresthesia, most frequently described as scalp tingling. In most cases, it was mild and transient and usually occurred at the beginning of treatment.
Collagen Disorders: Systemic lupus erythematosus, positive antinuclear factor.
Eyes: Dry eyes.
Immunological System: Antimitochondrial antibodies.
Musculoskeletal System: Muscle cramps, toxic myopathy.
Respiratory System: Bronchospasm.
Skin and Appendages: Rashes of various types, such as generalized maculopapular, lichenoid, urticarial, bullous lichen planus, psoriaform, and facial erythema; Peyronie's disease; reversible alopecia.
Urinary System: Difficulty in micturition, including acute urinary bladder retention.
Following approval for marketing in the United Kingdom, a monitored release survey involving approximately 6,800 patients was conducted for further safety and efficacy evaluation of this product. Results of this survey indicate that the type, severity, and incidence of adverse effects were comparable to those cited above.
Potential Adverse Effects
In addition, other adverse effects not listed above have been reported with other beta-adrenergic blocking agents.
Central Nervous System
Reversible mental depression progressing to catatonia, an acute reversible syndrome characterized by disorientation for time and place, short-term memory loss, emotional lability, slightly clouded sensorium, and decreased performance on psychometrics.
Intensification of A-V block (see CONTRAINDICATIONS).
Agranulocytosis, thrombocytopenic or nonthrombocytopenic purpura.
Mesenteric artery thrombosis, ischemic colitis.
The oculomucocutaneous syndrome associated with the beta-blocker practolol has not been reported with labetalol HCl.
Clinical Laboratory Tests
There have been reversible increases of serum transaminases in 4% of patients treated with labetalol HCl and tested and, more rarely, reversible increases in blood urea.
What drugs interact with Trandate (labetalol)?
- In one survey, 2.3% of patients taking labetalol HCl in combination with tricyclic antidepressants experienced tremor, as compared to 0.7% reported to occur with labetalol HCl alone. The contribution of each of the treatments to this adverse reaction is unknown, but the possibility of a drug interaction cannot be excluded.
- Drugs possessing beta-blocking properties can blunt the bronchodilator effect of beta-receptor agonist drugs in patients with bronchospasm; therefore, doses greater than the normal antiasthmatic dose of beta-agonist bronchodilator drugs may be required.
- Cimetidine has been shown to increase the bioavailability of labetalol HCl. Since this could be explained either by enhanced absorption or by an alteration of hepatic metabolism of labetalol HCl, special care should be used in establishing the dose required for blood pressure control in such patients.
- Synergism has been shown between halothane anesthesia and intravenously administered labetalol HCl. During controlled hypotensive anesthesia using labetalol HCl in association with halothane, high concentrations (3% or above) of halothane should not be used because the degree of hypotension will be increased and because of the possibility of a large reduction in cardiac output and an increase in central venous pressure. The anesthesiologist should be informed when a patient is receiving labetalol HCl.
- Labetalol HCl blunts the reflex tachycardia produced by nitroglycerin without preventing its hypotensive effect. If labetalol HCl is used with nitroglycerin in patients with angina pectoris, additional antihypertensive effects may occur.
- Care should be taken if labetalol is used concomitantly with calcium antagonists of the verapamil type.
- Both digitalis glycosides and beta-blockers slow atrioventricular conduction and decrease heart rate. Concomitant use can increase the risk of bradycardia.
Risk of Anaphylactic Reaction
- While taking beta-blockers, patients with a history of severe anaphylactic reaction to a variety of allergens may be more reactive to repeated challenge, either accidental, diagnostic, or therapeutic. Such patients may be unresponsive to the usual doses of epinephrine used to treat allergic reaction.
Drug/Laboratory Test Interactions
- The presence of labetalol metabolites in the urine may result in falsely elevated levels of urinary catecholamines, metanephrine, normetanephrine, and vanillylmandelic acid when measured by fluorimetric or photometric methods. In screening patients suspected of having a pheochromocytoma and being treated with labetalol HCl, a specific method, such as a high-performance liquid chromatographic assay with solid-phase extraction (e.g., J Chromatogr 385:241,1987) should be employed in determining levels of catecholamines.
- Labetalol HCl has also been reported to produce a false-positive test for amphetamine when screening urine for the presence of drugs using the commercially available assay methods TOXI-LAB A (thin-layer chromatographic assay) and EMIT-d.a.u. (radioenzymatic assay).
- When patients being treated with labetalol have a positive urine test for amphetamine using these techniques, confirmation should be made by using more specific methods, such as a gas chromatographic-mass spectrometer technique.
Trandate (labetalol) is a beta-blocker used to treat high blood pressure (hypertension). Common side effects of Trandate include fatigue, dizziness, nausea, headache, diarrhea, fluid retention (edema), shortness of breath, and rarely, postural hypotension (a rapid decrease in blood pressure when going from the lying or seated position to the standing position that may cause light-headedness or fainting). There are no adequate studies of Trandate during pregnancy. Trandate is excreted in breast milk. It should be used cautiously in breastfeeding mothers because of the risk that the infant may develop a slow heart rate.
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High blood pressure (hypertension) is a disease in which pressure within the arteries of the body is elevated. About 75 million people in the US have hypertension (1 in 3 adults), and only half of them are able to manage it. Many people do not know that they have high blood pressure because it often has no has no warning signs or symptoms. Systolic and diastolic are the two readings in which blood pressure is measured. The American College of Cardiology released new guidelines for high blood pressure in 2017. The guidelines now state that blood normal blood pressure is 120/80 mmHg. If either one of those numbers is higher, you have high blood pressure. The American Academy of Cardiology defines high blood pressure slightly differently. The AAC considers 130/80 mm Hg. or greater (either number) stage 1 hypertension. Stage 2 hypertension is considered 140/90 mm Hg. or greater. If you have high blood pressure you are at risk of developing life threatening diseases like stroke and heart attack.REFERENCE: CDC. High Blood Pressure. Updated: Nov 13, 2017.
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Things to Know About High Blood Pressure Treatment
High blood pressure (hypertension) means high pressure (tension) in the arteries. Treatment for high blood pressure include lifestyle modifications (alcohol, smoking, coffee, salt, diet, exercise), drugs and medications such as ACE inhibitors, angiotensin receptor blockers, beta blockers, diuretics, calcium channel blockers (CCBs), alpha blockers, clonidine, minoxidil, and Exforge.
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What Is High Blood Pressure (Hypertension)?
High blood pressure or hypertension is when the blood pressure readings consistently range from 140 or higher for systolic or 90 or higher for diastolic. Blood pressure readings above 180/120 mmHg are dangerously high and require immediate medical attention.
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Most people with high blood pressure have no signs or symptoms, even if blood pressure readings reach dangerously high levels. In some patients, symptoms may include fatigue, headaches, dizziness, confusion, sweating, chest pain and vision problems.
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Medications & Supplements
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
Professional side effects and drug interactions sections courtesy of the U.S. Food and Drug Administration.