Tembexa (brincidofovir) is a newly-approved medication for the treatment of smallpox caused by the smallpox virus. Although the medication is convenient because it only requires two doses, it has many serious potential risks and side effects. Tembexa (brincidofovir) is FDA approved, but it's currently not available for use.
Tembexa (brincidofovir) is an antiviral medication. It prevents the smallpox virus from making copies of itself and spreading in your body.
| Common Brands | Tembexa |
|---|---|
| Drug Class | Antiviral |
| Controlled Substance Classification | Not a controlled medication |
| Generic Status | No lower-cost generic available |
| Availability | Prescription only |
The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
There's no information about side effects when taken for smallpox treatment. Below are side effects reported in adults taking the tablets not specifically for smallpox.
Contact your healthcare provider immediately if you experience any of the following.
For the tablets only:
For the suspension only:
Tembexa (brincidofovir) can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.
A higher risk for death is possible when Tembexa (brincidofovir) is taken longer than what's recommended for smallpox treatment. In studies involving a different viral infection (not smallpox), more deaths happened in people using Tembexa (brincidofovir) for a few months compared to those who didn't take this medication.
Take Tembexa (brincidofovir) exactly as prescribed for smallpox only. Don't take extra doses or use it longer than what's prescribed. This is to make sure Tembexa (brincidofovir) is as safe for you as possible.
Tembexa (brincidofovir) can cause liver damage that can lead to serious liver problems. You'll need to get blood tests to check your liver health before and during treatment to make sure your liver is working properly. Seek medical attention right away if you notice swelling of your stomach, stomach pain, yellowing of your skin or the whites of your eyes, dark or brown urine, nausea, vomiting, or confusion. You might need to stop using the medication to prevent further liver damage.
Tembexa (brincidofovir) can cause diarrhea, nausea, vomiting, and stomach pain. Diarrhea and vomiting can lead to dehydration (e.g., dry mouth, not urinating as much, lightheadedness, dizziness). Contact your provider if you have these side effects after the first dose of Tembexa (brincidofovir). In some cases, your provider might tell you to stop taking the medication.
There haven't been any human studies looking at how Tembexa (brincidofovir) affects pregnant females, so it's not completely known how safe it is. However, in animal studies, Tembexa (brincidofovir) caused significant harm to babies (e.g., development issues, death) when taken by mothers during pregnancy. Due to these findings, avoid the use of Tembexa (brincidofovir) in pregnant females, and find alternative treatment options. If you're a female of childbearing age, use birth control during treatment with Tembexa (brincidofovir) and for at least 2 months after your last dose. If you're a male taking Tembexa (brincidofovir) with female partners who can get pregnant, use condoms during treatment and for at least 4 months after your last dose.
Tembexa (brincidofovir) can potentially cause cancer in humans. In animal studies, Tembexa (brincidofovir) caused certain types of cancer. To lower your risk for cancer, don't crush or cut the tablets. Also, don't let any broken tablets or the suspension to come into contact with your skin or mucous membranes (e.g., in your nose). If this happens, wash the affected area(s) well with soap and water. If your eyes came into contact with Tembexa (brincidofovir), rinse your eyes with water.
There isn't enough information to know if Tembexa (brincidofovir) can affect the ability to have children (fertility) in human males. But based on animal studies, Tembexa (brincidofovir) can potentially cause male infertility that can be permanent. This means it could be harder or impossible to have children. If you have concerns about this issue, speak to your provider.
Tablet| Dosage | Quantity | Price as low as | Price per unit |
|---|---|---|---|
| 100mg | 30 tablets | $5.57 | $0.19 |
Oral tablets: Each tablet contains 100 mg of brincidofovir.
Oral suspension: Each 5 mL (teaspoonful) contains 50 mg of brincidofovir.
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Tembexa is not available at this time, even though the FDA approved the medication in 2021. Since its approval, the manufacturer of Tembexa received funding from a government program to make enough of the medication for possible public health emergency use. It's expected to be available in the near future. If you need treatment for smallpox right now, Tpoxx (tecovirimat) is an alternative medication that might be available to you. Ask your provider for more information about Tpoxx.
Tembexa's efficacy has only been studied in animals, not humans. Smallpox has been eradicated (no longer occurs naturally), so it would be unethical to infect humans just for the sake of the study. Animal studies showed that Tembexa prevented more deaths from smallpox-related viruses than placebo (sugar pill). Based on these results, researchers believe that Tembexa can potentially work against smallpox in humans.
Smallpox is a contagious, long-lasting infection that has several stages. About 30% of people with smallpox can die from the infection. Those who survive can have permanent scars on their body (especially on the face), and others can become blind. Taking Tembexa might help stop the smallpox virus from making copies of itself so it can't spread.
Currently, Tembexa isn't FDA approved to treat monkeypox. There’s ongoing research studying whether Tembexa can be used for monkeypox since this virus is similar to smallpox. There isn't enough information to know if Tembexa works well against monkeypox in humans, but it shows some promise in animal studies. It's important to know that studies showed a higher risk of death in people taking Tembexa for a few months for a virus that wasn't the smallpox. Take Tembexa exactly as prescribed to make sure it's as safe for you as possible.
Because Tembexa can cause liver damage, your provider will order a blood test that checks your liver health before and during treatment. Additionally, if you're a female of childbearing age, you'll need to take a pregnancy test to make sure you're not pregnant before starting Tembexa. This is because the medication can potentially cause harm to unborn babies.
You can take the Tembexa tablets with a low-fat meal (about 400 calories, with about 25% of calories from fat) or on an empty stomach. Ask your provider about examples of low-fat meals that fit this criteria. On the other hand, you should take the suspension form on an empty stomach. This is because the effect of food on the suspension hasn't been studied, so it's not known if food lowers how much medication your body absorbs.
