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New Oral Agent for Hereditary Angioedema Treatment: Sebetralstat

Hereditary angioedema (HAE) is a rare and often debilitating genetic disorder characterized by recurrent episodes of severe swelling. These attacks can affect various parts of the body, including the abdomen, extremities, face, and, most dangerously, the throat, posing a significant risk of asphyxiation. Traditionally, managing these attacks has involved injectable treatments, which can be inconvenient and challenging for patients. However, a groundbreaking development in the form of oral sebetralstat offers new hope for those living with HAE.

Understanding Hereditary Angioedema

HAE is primarily caused by mutations in the SERPING1 gene, which leads to a deficiency or dysfunction of C1 inhibitor, a protein that regulates the kallikrein-kinin system. This dysregulation results in excessive production of bradykinin, a peptide that increases blood vessel permeability and leads to the characteristic swelling of HAE.

The unpredictable nature of HAE attacks necessitates prompt and effective treatment. Delays in administering treatment can prolong suffering and increase the risk of severe complications. This is where sebetralstat, an innovative oral plasma kallikrein inhibitor, comes into play.

What is Sebetralstat?

Sebetralstat is an oral medication specifically designed for the on-demand treatment of HAE attacks. Unlike traditional injectable treatments, sebetralstat can be taken orally, providing a more convenient and potentially quicker option for patients. It works by inhibiting plasma kallikrein, thereby reducing the production of bradykinin and alleviating the symptoms of an HAE attack.

Clinical Trial Insights

A recent phase 3 clinical trial has shed light on the efficacy and safety of sebetralstat. The trial involved 136 participants aged 12 years or older, all diagnosed with type 1 or type 2 HAE. Participants were randomly assigned to receive either sebetralstat (300 mg or 600 mg) or a placebo during an HAE attack.

Key Findings:

  • Primary Outcome: The time to the beginning of symptom relief was significantly faster with sebetralstat. The median time for symptom relief was 1.61 hours for the 300 mg dose and 1.79 hours for the 600 mg dose, compared to 6.72 hours for the placebo.

  • Secondary Outcomes: Sebetralstat also showed a faster reduction in attack severity and complete resolution of the attack. The median time to severity reduction was 9.27 hours (300 mg) and 7.75 hours (600 mg), compared to more than 12 hours for the placebo. Additionally, complete resolution within 24 hours was achieved in 42.5% of attacks with the 300 mg dose, 49.5% with the 600 mg dose, and only 27.4% with the placebo.

  • Safety: The safety profile of sebetralstat was similar to that of the placebo, with no serious adverse events related to the trial medication.


These results indicate that sebetralstat not only provides faster relief but also does so safely, making it a promising option for HAE patients.

The Impact of Oral Sebetralstat

The development of sebetralstat marks a significant advancement in the treatment of HAE. By offering an oral alternative to injectable therapies, it addresses several challenges faced by patients, such as the need for injections, potential delays in treatment, and the psychological burden of managing frequent, unpredictable attacks.

Looking Ahead

As we look to the future, the introduction of sebetralstat could transform the standard of care for HAE. Ongoing research and long-term studies will continue to evaluate its effectiveness and safety, potentially expanding its use and providing further insights into its benefits.

For more detailed information on the clinical trial and results, you can access the full study here.


Oral sebetralstat represents a leap forward in the management of hereditary angioedema, providing patients with a more accessible and effective treatment option. As research progresses, it is poised to become a cornerstone of HAE treatment, empowering patients to manage their condition with greater ease and confidence.

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