Patient Leaflet Updated 02-Feb-2026 | Merck Sharp & Dohme (UK) Limited
CAPVAXIVE solution for injection in pre-filled syringe
CAPVAXIVE® solution for injection in pre-filled syringe
Pneumococcal polysaccharide conjugate vaccine (21-valent)
▼This medicine is subject to additional monitoring. This will allow quick identification of new safety information. You can help by reporting any side effects you may get. See the end of section 4 for how to report side effects.
1. What CAPVAXIVE is and what it is used for
2. What you need to know before you receive CAPVAXIVE
3. How CAPVAXIVE is given
4. Possible side effects
5. How to store CAPVAXIVE
6. Contents of the pack and other information
CAPVAXIVE is a pneumococcal vaccine given to:
The vaccine works by helping your body to make its own antibodies, which protect you against these diseases.
Talk to your doctor, pharmacist, or nurse before you receive CAPVAXIVE if:
As with any vaccine, CAPVAXIVE may not fully protect all those who get the vaccine.
CAPVAXIVE has not been studied in children and adolescents younger than 18 years of age.
CAPVAXIVE can be given at the same time as the flu vaccine (inactivated influenza).
Tell your doctor, pharmacist, or nurse if:
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor, pharmacist, or nurse for advice before you receive this vaccine.
CAPVAXIVE has no or negligible influence on the ability to drive and use machines. However, some of the effects mentioned under section 4 “Possible side effects” may temporarily affect the ability to drive or use machines.
This medicine contains less than 1 mmol sodium (23 mg) per dose, that is to say essentially ‘sodium-free’.
This medicine contains 0.5 mg of polysorbate 20 in each 0.5 mL dose of solution for injection.
Polysorbates may cause allergic reactions. Tell your doctor if you have any known allergies.
Tell your doctor, pharmacist, or nurse if you have been given a pneumococcal vaccine before.
You will receive 1 injection (1 dose of 0.5 mL).
Your doctor or nurse will give the vaccine into your upper arm muscle.
If you have any further questions on the use of CAPVAXIVE, ask your doctor, pharmacist, or nurse.
Like all vaccines, CAPVAXIVE can cause side effects, although not everybody gets them.
Rare (may affect up to 1 in 1 000 people):
CAPVAXIVE may cause allergic (hypersensitivity) reactions including excessive contraction of the airway muscles causing breathing difficulty (bronchospasm). Get medical care right away if you have symptoms of an allergic reaction, which may include:
The following side effects have been seen after the use of CAPVAXIVE:
Very common (may affect more than 1 in 10 people):
Common (may affect up to 1 in 10 people):
Uncommon (may affect up to 1 in 100 people):
These side effects are generally mild or moderate and last a short time.
If you get any side effects, talk to your doctor, pharmacist, or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects, you can help provide more information on the safety of this medicine.
Keep this vaccine out of the sight and reach of children.
Do not use this vaccine after the expiry date which is stated on the carton and syringe label after EXP. The expiry date refers to the last day of that month.
Store in a refrigerator (2° C – 8° C). Do not freeze. Keep the pre-filled syringe in the outer carton in order to protect from light.
CAPVAXIVE should be administered as soon as possible after being removed from the refrigerator. However, in circumstances where CAPVAXIVE is temporarily held outside of refrigeration, the vaccine is stable at temperatures up to 25 °C for 96 hours. At the end of this time period CAPVAXIVE should be used or discarded. This information is intended to guide healthcare professionals in case of temporary temperature excursions only.
The active substances are:
Each polysaccharide is linked to a carrier protein (CRM197). The polysaccharides and the carrier protein are not alive and do not cause disease.
One dose (0.5 mL) contains approximately 65 micrograms carrier protein.
The other ingredients are sodium chloride (NaCl), histidine, polysorbate 20 (E432), hydrochloric acid (HCl; for pH adjustment) and water for injections. For more information on polysorbate 20 (E432), see Section 2.
CAPVAXIVE is a colourless, clear to opalescent solution for injection (injection), provided in a single-dose, pre-filled syringe (0.5 mL). CAPVAXIVE is available in pack sizes of 1 or 10 pre-filled syringes, either without needles, with 1 separate needle or with 2 separate needles per pre-filled syringe.
Not all pack sizes may be marketed.
Marketing Authorisation Holder:
Manufacturer:
For any information about this medicine, please contact:
This leaflet was last revised in August 2025.
© 2025 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.
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