Tecovirimat SIGA
Authorised
This medicine is authorised for use in the European Union
tecovirimat monohydrate
MedicineHumanAuthorised
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- Application under evaluation
- CHMP opinion
- European Commission decision
Overview
Tecovirimat SIGA is a medicine to treat smallpox and cowpox, two infections caused by viruses belonging to the same family (orthopoxviruses). It is also used to treat complications that can happen following vaccination against smallpox. Tecovirimat SIGA is used in adults and children weighing at least 13 kg.
It contains the active substance tecovirimat.
Tecovirimat SIGA can only be obtained with a prescription. It is available as capsules to be taken by mouth, and the dose depends on the patient’s bodyweight. Treatment should be started as soon as possible after diagnosis.
For more information about using Tecovirimat SIGA, see the package leaflet or contact your doctor or pharmacist.
Tecovirimat SIGA works by interfering with a protein called VP37 that is found on the surface of orthopoxviruses, including smallpox and cowpox. By interacting with this protein, the medicine prevents the viruses from reproducing normally, slowing down the spread of infection.
Because smallpox and cowpox are either eradicated (smallpox) or occur sporadically in the EU, studies to assess the effectiveness of Tecovirimat SIGA in infected people could not be carried out.
The effectiveness of Tecovirimat SIGA was therefore evaluated based on studies in animals infected with lethal doses of orthopoxviruses, on studies on the medicine’s effects in the human body, and on the way the medicine is absorbed, modified and removed from the body in humans and animals (pharmacodynamic and pharmacokinetic studies).
Studies in animals who received lethal doses of either monkeypox or rabbitpox viruses, which are other orthopoxviruses, showed that treatment with Tecovirimat SIGA for 14 days significantly increased survival rates. When treatment was started either 4 or 5 days after infection, between 80 and 100% of the animals treated with Tecovirimat SIGA survived. No animals in the placebo (a dummy treatment) groups survived. The survival rate was 50% when treatment with Tecovirimat SIGA was started 6 days after the infection.
The dose that is needed in humans to ensure that Tecovirimat SIGA will work as expected was determined based on comparative pharmacokinetic and pharmacodynamic studies carried out in both animals and in humans. Pharmacokinetic studies look at how the medicine behaves in the body and pharmacodynamics studies look at how it affects the body.
Studies carried out with Tecovirimat SIGA are described in more detail in the medicine’s assessment report.
For the full list of side effects and restrictions with Tecovirimat SIGA, see the package leaflet.
The most common side effects with Tecovirimat SIGA include headache (which may affect more than 1 in 10 people) and nausea (feeling sick) (which may affect up to 1 in 10 people).
The European Medicines Agency considered that Tecovirimat SIGA is effective at reducing mortality caused by smallpox and cowpox, based on animal studies. While the safety of the medicine was assessed in non-infected people, the side effects of Tecovirimat SIGA are expected to be similar in infected people and are considered acceptable. The Agency therefore decided that Tecovirimat SIGA’s benefits are greater than its risks and it can be authorised for use in the EU.
There are no other treatments authorised for cowpox infections which, although rare, can be fatal. In addition, while smallpox has been eradicated, it is an extremely serious infection for which no other treatment exists should an outbreak occur.
Tecovirimat SIGA has been authorised under ‘exceptional circumstances’. This is because it has not been possible to obtain complete information about the medicine due to the rarity of the diseases.
The company that markets Tecovirimat SIGA will therefore provide data on the effectiveness and safety of the medicine in patients given the medicine should an outbreak of smallpox occur. Every year, the Agency will review any new information that becomes available and this overview will be updated as necessary.
Following a review carried out in 2026, the use of Tecovirimat SIGA for the treatment of mpox in adults and children weighing at least 13kg is no longer authorised.
Recommendations and precautions to be followed by healthcare professionals and patients for the safe and effective use of Tecovirimat SIGA have been included in the summary of product characteristics and the package leaflet.
As for all medicines, data on the use of Tecovirimat SIGA are continuously monitored. Suspected side effects reported with Tecovirimat SIGA are carefully evaluated and any necessary action taken to protect patients.
Tecovirimat SIGA received a marketing authorisation valid throughout the EU on 06 January 2022.
Product information
Latest procedure affecting product information:REF/0000287477
28/05/2026
This medicine’s product information is available in all official EU languages.
Select 'available languages' to access the language you need.
Product information documents contain:
- summary of product characteristics (annex I);
- manufacturing authorisation holder responsible for batch release (annex IIA);
- conditions of the marketing authorisation (annex IIB);
- labelling (annex IIIA);
- package leaflet (annex IIIB).
Product details
- Name of medicine
- Tecovirimat SIGA
- Active substance
- tecovirimat
- International non-proprietary name (INN) or common name
- tecovirimat monohydrate
- Therapeutic area (MeSH)
- Poxviridae Infections
- Cowpox
- Monkeypox
- Vaccinia
- Smallpox
- Anatomical therapeutic chemical (ATC) code
- J05AX24
Pharmacotherapeutic group
Antivirals for systemic useTherapeutic indication
Tecovirimat SIGA is indicated for the treatment of the following viral infections in adults and children with body weight at least 13 kg:
- Smallpox
- Monkeypox
- Cowpox
Tecovirimat SIGA is also indicated to treat complications due to replication of vaccinia virus following vaccination against smallpox in adults and children with body weight at least 13 kg (see sections 4.4 and 5.1).
Tecovirimat SIGA should be used in accordance with official recommendations.
Assessment history
News on Tecovirimat SIGA
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