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Trandate 5mg/ml solution for injection
Labetalol Hydrochloride 5mg/ml Solution for Injection


Labetalol hydrochloride 5mg/ml


Solution for Injection




Therapeutic indications
Trandate Injection/Labetalol Injection is indicated for the treatment of:-



Severe hypertension, including severe hypertension of pregnancy, when rapid
control of blood pressure is essential.


Anaesthesia when a hypotensive technique is indicated.


Hypertensive episodes following acute myocardial infarction.

Posology and method of administration
Trandate Injection/Labetalol Injection is intended for intravenous use in hospitalised
patients. The plasma concentrations achieved after intravenous dose of labetalol in
severe hypertension are substantially greater than those following oral administration
of the drug and provide a greater degree of blockade of alpha-adrenoceptors
necessary to control the more severe disease. Patients should, therefore, always
receive the drug whilst in the supine or left lateral position. Raising the patient into
the upright position, within three hours of intravenous labetalol administration, should
be avoided since excessive postural hypotension may occur.
Bolus injection

If it is essential to reduce blood pressure quickly, as for example, in hypertensive
encephalopathy, a dose of 50mg of labetalol hydrochloride should be given by
intravenous injection over a period of at least one minute. If necessary, doses of
50mg may be repeated at five minute intervals until a satisfactory response occurs.
The total dose should not exceed 200mg. After bolus injection, the maximum effect
usually occurs within five minutes and the effective duration of action is usually
about six hours but may be as long as eighteen hours.
Intravenous infusion
An alternative method of administering labetalol is intravenous infusion of a solution
made by diluting the contents of two ampoules (200mg) to 200ml with Sodium
Chloride and Dextrose Injection BP or 5% Dextrose Intravenous Infusion BP. The
resultant infusion solution contains 1mg/ml of labetalol hydrochloride. It should be
administered using a paediatric giving set fitted with a 50ml graduated burette to
facilitate dosage.
In the hypertension of pregnancy: The infusion can be started at the rate of 20mg per
hour and this dose may be doubled every thirty minutes until a satisfactory reduction
in blood pressure has been obtained or a dosage of 160mg per hour is reached.
Occasionally, higher doses may be necessary.
In hypertensive episodes following acute myocardial infarction: The infusion should
be commenced at 15mg per hour and gradually increased to a maximum of 120mg
per hour depending on the control of blood pressure.
In hypertension due to other causes: The rate of infusion of labetalol hydrochloride
should be about 2mg (2ml of infusion solution) per minute, until a satisfactory
response is obtained; the infusion should then be stopped. The effective dose is
usually in the range of 50-200mg depending on the severity of the hypertension. For
most patients it is unnecessary to administer more than 200mg but larger doses may
be required especially in patients with phaeochromocytoma. The rate of infusion may
be adjusted according to the response, at the discretion of the physician. The blood
pressure and pulse rate should be monitored throughout the infusion.
It is desirable to monitor the heart rate after injection and during infusion. In most
patients, there is a small decrease in the heart rate; severe bradycardia is unusual but
may be controlled by injecting atropine 1-2 mg intravenously. Respiratory function
should be observed particularly in patients with any known impairment.
Once the blood pressure has been adequately reduced, maintenance therapy with
labetalol tablets should be instituted with a starting dose of one 100 mg tablet twice
daily (see labetalol tablet SmPC for further details). Trandate Injection/Labetalol
Injection has been administered to patients with uncontrolled hypertension already
receiving other hypotensive agents, including beta-blocking drugs, without adverse
In hypotensive anaesthesia: Induction should be with standard agents (e.g. sodium
thiopentone) and anaesthesia maintained with nitrous oxide and oxygen with or
without halothane. The recommended starting dose of Trandate Injection/Labetalol
Injection is 10-20 mg intravenously depending on the age and condition of the
patient. Patients for whom halothane is contra-indicated usually require a higher
initial dose of labetalol hydrochloride (25-30 mg). If satisfactory hypotension is not
achieved after five minutes, increments of 5-10 mg should be given until the desired
level of blood pressure is attained.
Halothane and labetalol act synergistically therefore the halothane concentration
should not exceed 1-1.5% as profound falls in blood pressure may be precipitated.

Following Trandate Injection/Labetalol Injection the blood pressure can be quickly
and easily adjusted by altering the halothane concentration and/or adjusting table tilt.
The mean duration of hypotension following 20-25 mg of labetalol hydrochloride is
fifty minutes.
Hypotension induced by Trandate Injection/Labetalol Injection is readily reversed by
atropine 0.6 mg and discontinuation of halothane.
Tubocurarine and pancuronium may be used when assisted or controlled ventilation is
required. Intermittent Positive Pressure Ventilation (IPPV) may further increase the
hypotension resulting from Trandate Injection/Labetalol Injection and/or halothane.
Safety and efficacy have not been established.




Cardiogenic shock.
Uncontrolled, incipient or digitalis refractory heart failure.
Sick sinus syndrome (including sino-atrial block).
Second or third degree heart block.
Prinzmetal’s angina.
History of wheezing or asthma.
Untreated phaeochromocytoma.
Metabolic acidosis.
Bradycardia (<45-50 bpm).
Hypersensitivity to labetalol.
Severe peripheral circulatory disturbances.
Where peripheral vasoconstriction suggests low cardiac output, the use of
Trandate Injection/Labetalol Injection to control hypertensive episodes following
acute myocardial infarction is contra-indicated.

Special warnings and precautions for use
There have been reports of skin rashes and/or dry eyes associated with the use of
beta-adrenoceptor blocking drugs. The reported incidence is small and in most cases
the symptoms have cleared when the treatment was withdrawn. Gradual
discontinuance of the drug should be considered if any such reaction is not otherwise
There have been rare reports of severe hepatocellular injury with labetalol therapy.
The hepatic injury is usually reversible and has occurred after both short and long
term treatment. Appropriate laboratory testing should be done at the first sign or
symptom of liver dysfunction. If there is laboratory evidence of liver injury or the
patient is jaundiced, labetalol therapy should be stopped and not re-started.
Due to negative inotropic effects, special care should be taken with patients whose
cardiac reserve is poor and heart failure should be controlled before starting labetalol
Patients, particularly those with ischemic heart disease, should not
interrupt/discontinue abruptly labetalol therapy. The dosage should gradually be

reduced, i.e. over 1-2 weeks, if necessary at the same time initiating replacement
therapy, to prevent exacerbation of angina pectoris. In addition, hypertension and
arrhythmias may develop.
It is not necessary to discontinue labetalol therapy in patients requiring anaesthesia,
but the anaesthetist must be informed and the patient should be given intravenous
atropine prior to induction. During anaesthesia labetalol may mask the compensatory
physiological responses to sudden haemorrhage (tachycardia and vasoconstriction).
Close attention must therefore be paid to blood loss and the blood volume maintained.
If beta-blockade is interrupted in preparation for surgery, therapy should be
discontinued for at least 24 hours. Anaesthetic agents causing myocardial depression
(e.g. cyclopropane, trichloroethylene) should be avoided. Labetalol may enhance the
hypotensive effects of halothane.
In patients with peripheral circulatory disorders (Raynaud’s disease or syndrome,
intermittent claudication), beta-blockers should be used with great caution as
aggravation of these disorders may occur.
Beta-blockers may induce bradycardia. If the pulse rate decreases to less than 50-55
beats per minute at rest and the patient experiences symptoms related to the
bradycardia, the dosage should be reduced.
Beta-blockers, even those with apparent cardioselectivity, should not be used in
patients with asthma or a history of obstructive airways disease unless no alternative
treatment is available. In such cases the risk of inducing bronchospasm should be
appreciated and appropriate precautions taken. If bronchospasm should occur after
the use of labetalol it can be treated with a beta2-agonist by inhalation, e.g. salbutamol
(the dose of which may need to be greater than the usual in asthma) and, if necessary,
intravenous atropine 1mg.
Due to a negative effect on conduction time, beta-blockers should only be given with
caution to patients with first degree heart block. Patients with liver or kidney
insufficiency may need a lower dosage, depending on the pharmacokinetic profile of
the compound. The elderly should be treated with caution, starting with a lower
dosage but tolerance is usually good in the elderly.
Patients with a history of psoriasis should take beta-blockers only after careful
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 use to treat allergic reaction.
The label will state “Do not take Trandate Injection/Labetalol Injection if you have a
history of wheezing or asthma as it can make your breathing worse.”


Interaction with other medicinal products and other forms of interaction
Concomitant use not recommended:

Calcium antagonists such as verapamil and to a lesser extent diltiazem have a
negative influence on contractility and atrio-ventricular conduction.
Digitalis glycosides used in association with beta-blockers may increase atrioventricular conduction time.
Clonidine: Beta-blockers increase the risk of rebound hypertension. When
clonidine is used in conjunction with non-selective beta-blockers, such as

propranolol, treatment with clonidine should be continued for some time after
treatment with the beta-blocker has been discontinued.
Monoamineoxidase inhibitors (except MOA-B inhibitors).

Use with caution:

Class I antiarrhythmic agents (e.g. disopyramide, quinidine) and amiodarone may
have potentiating effects on atrial conduction time and induce negative inotropic
Insulin and oral antidiabetic drugs may intensify the blood sugar lowering effect,
especially of non-selective beta-blockers. Beta- blockade may prevent the
appearance of signs of hypoglycaemia (tachycardia).
Anaesthetic drugs may cause attenuation of reflex tachycardia and increase the
risk of hypotension. Continuation of beta-blockade reduces the risk of
arrhythmia during induction and intubation. The anaesthesiologist should be
informed when the patient is receiving a beta-blocking agent. Anaesthetic agents
causing myocardial depression, such as cyclopropane and trichlorethylene, are
best avoided.
Cimetidine, hydralazine and alcohol may increase the bioavailability of labetalol.
Several different drugs or drug classes may enhance the hypotensive effects of
labetalol: ACE inhibitors; angiotensin-II antagonists; aldesleukin, alprostadil;
anxiolytics; hypnotics; moxisylyte; diuretics; alpha-blockers.
Several different drugs or drug classes may antagonise the hypotensive effects of
labetalol: NSAIDs, corticosteroids; oestrogens; progesterones.
Take into account:


Calcium antagonists: dihydropyridine derivates such as nifedipine. The risk of
hypotension may be increased. In patients with latent cardiac insufficiency,
treatment with beta-blockers may lead to cardiac failure.
Prostaglandin synthetase inhibiting drugs may decrease the hypotensive effect of
Sympathicomimetic agents may counteract the effect of beta-adrenergic blocking
Concomitant use of tricyclic antidepressants, barbiturates, phenothiazines or other
antihypertensive agents may increase the blood pressure lowering effect of
labetalol. Concomitant use of tricyclic antidepressants may increase the incidence
of tremor.
Labetalol has been shown to reduce the uptake of radioisotopes of
metaiodobenzylguanidine (MIBG), and may increase the likelihood of a false
negative study. Care should therefore be taken in interpreting results from MIBG
scintigraphy. Consideration should be given to withdrawing labetalol for several
days at least before MIBG scintigraphy, and substituting other beta or alphablocking drugs.
Antimalarials such as mefloquine or quinine may increase the risk of bradycardia.
Ergot derivatives may increase the risk of peripheral vasoconstriction.
Tropisetron may increase the risk of ventricular arrhythmia.
Labetalol interferes with laboratory tests for catecholamines.

Fertility, pregnancy and lactation

Although no teratogenic effects have been demonstrated in animals, labetalol should
only be used during the first trimester of pregnancy if the potential benefit outweighs
the potential risk.
Labetalol crosses the placental barrier and the possibility of the consequences of
alpha- and beta-adrenoceptor blockade in the foetus and neonate should be borne in
mind. Perinatal and neonatal distress (bradycardia, hypotension, respiratory
depression, hypoglycaemia, hypothermia) has been rarely reported. Sometimes these
symptoms have developed a day or two after birth. Response to supportive measures
(e.g. intravenous fluids and glucose) is usually prompt but with severe pre-eclampsia,
particularly after prolonged intravenous labetalol, recovery may be slower. This may
be related to diminished liver metabolism in premature babies.
Beta-blockers reduce placental perfusion, which may result in intrauterine foetal
death, immature and premature deliveries. There is an increased risk of cardiac and
pulmonary complications in the neonate in the post-natal period. Intra-uterine and
neonatal deaths have been reported with labetalol but other drugs (e.g. vasodilators,
respiratory depressants) and the effects of pre-eclampsia, intra-uterine growth
retardation and prematurity were implicated. Such clinical experience warns against
unduly prolonging high dose labetalol and delaying delivery and against coadministration of hydralazine.
Labetalol is excreted in breast milk. Breast-feeding is therefore not recommended.


Effects on ability to drive and use machines
There are no studies on the effect of this medicine on the ability to drive.
When driving vehicles or operating machines it should be taken into account
that occasionally dizziness or fatigue may occur.


Undesirable effects
Trandate Injection/Labetalol Injection is usually well tolerated. Excessive postural
hypotension may occur if patients are allowed to assume an upright position within
three hours of receiving Trandate Injection/Labetalol Injection.
Most side-effects are transient and occur during the first few weeks of treatment with
labetalol. They include:
Blood and the lymphatic system disorders
Rare reports of positive antinuclear antibodies unassociated with disease,
hyperkalaemia, particularly in patients who may have impaired renal excretion of
potassium, thrombocytopenia.
Psychiatric disorders
Depressed mood and lethargy, hallucinations, psychoses, confusion, sleep
disturbances, nightmares.
Nervous system disorders
Headache, tiredness, dizziness, tremor has been reported in the treatment of
hypertension of pregnancy.

Eye disorders
Impaired vision, dry eyes.
Cardiac disorders
Bradycardia, heart block, heart failure, hypotension.
Vascular disorders
Ankle oedema, increase of an existing intermittent claudication, postural hypotension,
cold or cyanotic extremities, Raynaud’s phenomenon, paraesthesia of the extremities.
Respiratory, thoracic and mediastinal disorders
Bronchospasm (in patients with asthma or a history of asthma), nasal congestion,
interstitial lung disease.
Gastrointestinal disorders
Epigastric pain, nausea, vomiting, diarrhoea.
Hepato-biliary disorders
Raised liver function tests, jaundice (both hepatocellular and cholestatic), hepatitis
and hepatic necrosis.
Skin and subcutaneous tissue disorders
Sweating, tingling sensation in the scalp, usually transient, may occur in a few
patients early in treatment, reversible lichenoid rash, systemic lupus erythematosus,
exacerbation of psoriasis.
Musculoskeletal, connective tissue and bone disorders:
Cramps, toxic myopathy.
Renal and urinary disorders
Acute retention of urine, difficulty in micturition.
Reproductive system and breast disorders
Ejaculatory failure.
General disorders and administration site conditions
Hypersensitivity (rash, pruritus, angioedema and dyspnoea), drug fever, masking of
the symptoms of thyrotoxicosis or hypoglycaemia, reversible alopecia.


Symptoms of overdosage are bradycardia, hypotension, bronchospasm and acute
cardiac insufficiency.
After an overdose or in case of hypersensitivity, the patient should be kept under
close supervision and be treated in an intensive-care ward. Artificial respiration may
be required. Bradycardia or extensive vagal reactions should be treated by
administering atropine or methylatropine. Hypotension and shock should be treated
with plasma/plasma substitutes and, if necessary, catecholamines. The beta-blocking
effect can be counteracted by slow intravenous administration of isoprenaline
hydrochloride, starting with a dose of approximately 5mcg/min, or dobutamine,
starting with a dose of approximately 2.5mcg/min, until the required effect has been
obtained. If this does not produce the desired effect, intravenous administration of

8-10 mg glucagon may be considered. If required the injection should be repeated
within one hour, to be followed, if necessary, by an iv infusion of glucagon at
1-3 mg/hour. Administration of calcium ions, or the use of a cardiac pacemaker, may
also be considered.
Oliguric renal failure has been reported after massive overdosage of labetalol orally.
In one case, the use of dopamine to increase the blood pressure may have aggravated
the renal failure.
Labetalol does have membrane stabilising activity which may have clinical
significance in overdosage.
Haemodialysis removes less than 1% labetalol hydrochloride from the circulation.




Pharmacodynamic properties
Labetalol lowers the blood pressure primarily by blocking peripheral arteriolar
alpha-adrenoceptors thus reducing peripheral resistance and, by Concurrent
beta-blockade protects the heart from reflex sympathetic drive that would
otherwise occur. Cardiac output is not significantly reduced at rest or after
moderate exercise. Increases in systolic blood pressure during exercise are
reduced but corresponding changes in diastolic pressure are essentially
In patients with angina pectoris co-existing with hypertension, the reduced
peripheral resistance decreases myocardial afterload and oxygen demand. All
these effects would be expected to benefit hypertensive patients and those with
coexisting angina.


Pharmacokinetic properties
The plasma half-life of labetalol is about 4 hours. About 50% of labetalol in
the blood is protein bound. Labetalol is metabolised mainly through
conjugation to inactive glucuronide metabolites. These are excreted both in
urine and via the bile into the faeces.
Only negligible amounts of the drug cross the blood brain barrier in animal


Preclinical safety data
Not applicable since Trandate Injection/Labetalol Injection has been used in clinical
practice for many years and its effects in man are well known.




List of excipients
Hydrochloric acid dilute
Sodium hydroxide
Water for Injection


Trandate Injection/Labetalol Injection has been shown to be incompatible with
sodium bicarbonate injection BP 4.2% w/v


Shelf life
24 months.


Special precautions for storage
Protect from light. Store below 30°C


Nature and contents of container
Type I Glass ampoules: 5 ampoules of 20ml (per pack).


Special precautions for disposal


Focus Pharmaceuticals Ltd
Capital House,
85 King William Street,
London EC4N 7BL,
United Kingdom.


PL 20046/0259





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Source: Medicines and Healthcare Products Regulatory Agency

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