This information is intended for use by health professionals

1. Name of the medicinal product

Zenalb 4.5

45 g/l solution for infusion

2. Qualitative and quantitative composition

Zenalb 4.5 is a solution containing 45 g/l (4.5%) of total protein of which at least 95% is human albumin.

A vial of 100 ml contains 4.5 g of human albumin.

Zenalb 4.5 has a mildly hypooncotic effect.

Excipient with known effect:

Zenalb 4.5 contains approximately 100 – 160 mmol/1 sodium.

For the full list of excipients, see section 6.1.

3. Pharmaceutical form

Solution for infusion.

A clear, slightly viscous liquid; it is almost colourless, yellow, amber or green.

4. Clinical particulars
4.1 Therapeutic indications

Zenalb 4.5 is indicated in all patients for the restoration and maintenance of circulating blood volume where volume deficiency has been demonstrated, and use of a colloid is appropriate.

4.2 Posology and method of administration

The concentration of the albumin preparation, dosage and the infusion-rate should be adjusted to the patient's individual requirements.


The dose required depends on the size of the patient, the severity of trauma or illness and on continuing fluid and protein losses. Measures of adequacy of circulating volume and not plasma albumin levels should be used to determine the dose required.

If human albumin is to be administered, haemodynamic performance should be monitored regularly; this may include:

- arterial blood pressure and pulse rate

- central venous pressure

- pulmonary artery wedge pressure

- urine output

- electrolyte

- haematocrit/haemoglobin

Method of administration

Human albumin can be directly administered by the intravenous route.

The infusion rate should be adjusted according to the individual circumstances and the indication.

In plasma exchange the infusion rate should be adjusted to the rate of removal.

4.3 Contraindications

Hypersensitivity to albumin preparations or to any of the excipients listed in section 6.1.

4.4 Special warnings and precautions for use

Standard measures to prevent infections resulting from the use of medicinal products prepared from human blood or plasma include selection of donors, screening of individual donations and plasma pools for specific markers of infection and the inclusion of effective manufacturing steps for the inactivation/removal of viruses. Despite this, when medicinal products prepared from human blood or plasma are administered, the possibility of transmitting infective agents cannot be totally excluded.

This also applies to unknown or emerging viruses and other pathogens.

There are no reports of virus transmissions with albumin manufactured to European Pharmacopoeia specifications by established processes.

Appropriate vaccination (hepatitis A and B) should be considered for patients in regular/repeated receipt of plasma-derived human albumin solutions.

It is strongly recommended that every time that Zenalb 4.5 is administered to a patient, the name and batch number of the product are recorded in order to maintain a link between the patient and the batch of the product.

Suspicion of allergic or anaphylactic type reactions requires immediate discontinuation of the infusion. In the case of shock, standard medical treatment for shock should be implemented.

Albumin should be used with caution in conditions where hypervolaemia and its consequences or haemodilution could represent a special risk for the patient. Examples of such conditions are:

- Decompensated cardiac insufficiency

- Hypertension

- Oesophageal varices

- Pulmonary oedema

- Haemorrhagic diathesis

- Severe anaemia

- Renal and post-renal anuria

200-250 g/l Human albumin solutions are relatively low in electrolytes compared to 40-50 g/l human albumin solutions. When albumin is given, the electrolyte status of the patient should be monitored (see section 4.2) and appropriate steps taken to restore or maintain the electrolyte balance.

If comparatively large volumes are to be replaced, controls of coagulation and haematocrit are necessary. Care must be taken to ensure adequate substitution of other blood constituents (coagulation factors, electrolytes, platelets and erythrocytes).

Hypervolaemia may occur if the dosage and rate of infusion are not adjusted to the patient's circulatory situation. At the first clinical signs of cardiovascular overload (headache, dyspnoea, jugular vein congestion), or increased blood pressure, raised venous pressure and pulmonary oedema, the infusion is to be stopped immediately.

This medicinal product contains 230 to 370 mg sodium per 100 ml, equivalent to 11.5 to 18.5% of the WHO recommended maximum daily intake of 2 g sodium for an adult.

4.5 Interaction with other medicinal products and other forms of interaction

No specific interactions of human albumin with other medicinal products are known.

4.6 Fertility, pregnancy and lactation


The safety of Zenalb 4.5 for use in human pregnancy has not been established in controlled clinical trials. However, clinical experience with albumin suggests that no harmful effects on the course of pregnancy, or on the foetus or the neonate are to be expected.

Experimental animal studies are insufficient to assess the safety with respect to reproduction, development of the embryo or foetus, the course of gestation and peri and postnatal development. However, human albumin is a normal constituent of human blood.


No animal reproduction studies have been conducted with Zenalb 4.5.

4.7 Effects on ability to drive and use machines

No effects on the ability to drive and use machines have been observed.

4.8 Undesirable effects

Summary of the safety profile

Mild reactions such as flush, urticaria, fever and nausea occur rarely. These reactions normally disappear rapidly when the infusion rate is slowed down or the infusion is stopped. Very rarely, severe reactions such as shock may occur. In these cases, the infusion should be stopped and appropriate treatment should be initiated.

Tabulated list of adverse reactions

Adverse reactions reported from post-marketing use of Zenalb 4.5 are classified according to system organ class and frequency. Frequency groupings are defined according to the following convention: very common (≥1/10); common (≥1/100 to <1/10); uncommon (≥1/1,000 to <1/100); rare (≥1/10,000 to <1/1,000); very rare (<1/10,000), not known (cannot be estimated from the available data).

MedDRA Standard System Organ Class

Not known

Nervous system disorders


Cardiac disorders




Vascular disorders



Respiratory, thoracic and mediastinal disorders



General disorders and administration site conditions

Feeling cold

Chest tightness


For safety information with respect to transmissible agents, see section 4.4.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme

Website: or search for MHRA Yellow Card in the Google Play or Apple App Store.

4.9 Overdose

Hypervolaemia may occur if the dosage and rate of infusion are too high. At the first clinical signs of cardiovascular overload (headache, dyspnoea, jugular vein congestion), or increased blood pressure, raised central venous pressure and pulmonary oedema, the infusion should be stopped immediately and the patient's haemodynamic parameters carefully monitored.

5. Pharmacological properties
5.1 Pharmacodynamic properties

Pharmacotherapeutic group: plasma substitutes and plasma protein fractions, ATC code: B05AA01

Human albumin accounts quantitatively for more than half of the total protein in the plasma and represents about 10% of the protein synthesis activity of the liver.

Physico-chemical data: human albumin 45 g/l is mildly hypooncotic to normal plasma.

The most important physiological functions of albumin result from its contribution to oncotic pressure of the blood and transport function. Albumin stabilises circulating blood volume and is a carrier of hormones, enzymes, medicinal products and toxins.

5.2 Pharmacokinetic properties

Under normal conditions, the total exchangeable albumin pool is 4-5 g/kg body weight, of which 40-45% is present intravascularly and 55-60% in the extravascular space. Increased capillary permeability will alter albumin kinetics and abnormal distribution may occur in conditions such as severe burns or septic shock.

Under normal conditions, the average half-life of albumin is about 19 days. The balance between synthesis and breakdown is normally achieved by feedback regulation. Elimination is predominantly intracellular and due to lysosome proteases.

In healthy subjects, less than 10% of infused albumin leaves the intravascular compartment during the first 2 hours following infusion. There is considerable individual variation in the effect on plasma volume. In some patients the plasma volume can remain increased for some hours. However, in critically ill patients, albumin can leak out of the vascular space in substantial amounts at an unpredictable rate.

5.3 Preclinical safety data

Human albumin is a normal constituent of plasma and acts like physiological albumin.

In animals, single dose toxicity testing is of little relevance and does not permit the evaluation of toxic or lethal doses or of a dose-effect relationship. Repeated dose toxicity testing is impracticable due to the development of antibodies to heterologous protein in animal models.

To date, human albumin has not been reported to be associated with embryo-foetal toxicity, oncogenic or mutagenic potential.

No signs of acute toxicity have been described in animal models.

6. Pharmaceutical particulars
6.1 List of excipients




6.2 Incompatibilities

Human albumin must not be mixed with other medicinal products (except those mentioned in section 6.6), whole blood and packed red cells.

6.3 Shelf life

Unopened: 36 months

Opened: 3 hours

6.4 Special precautions for storage

Store between 2°C and 25°C.

Do not freeze.

Store in the original container. Keep container in the outer carton in order to protect from light.

For storage conditions after opening the medicinal product, see section 6.3.

6.5 Nature and contents of container

The solution is contained in 50 ml; 100 ml; 250 ml or 500 ml colourless glass bottles (Type II) with stopper (halobutyl rubber), with an overseal (aluminium) and tamper evident flip-off cap (polypropylene).

Not all pack sizes may be marketed.

6.6 Special precautions for disposal and other handling

The solution can be directly administered by the intravenous route.

Albumin solutions must not be diluted with water for injections as this may cause haemolysis in recipients.

If large volumes are administered, the product should be warmed to room or body temperature before use.

Do not use solutions which are cloudy or have deposits. This may indicate that the protein is unstable or that the solution has become contaminated.

Once the infusion container has been opened, the contents should be used immediately or within 3 hours. Any unused product or waste material should be disposed of in accordance with local requirements.

7. Marketing authorisation holder

Bio Products Laboratory Limited

Dagger Lane




United Kingdom

8. Marketing authorisation number(s)

PL 08801/0006

9. Date of first authorisation/renewal of the authorisation

Date of first authorisation: 23 April 1993

Date of last renewal: 11 June 2010

10. Date of revision of the text

April 2019