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FDA approved Rhapsido for Chronic Spontaneous Urticaria Inadequately Controlled by H1 AntihistaminesFDA approved Rhapsido for Adults With Hard-to-Treat Hives

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Key Takeaway
Consider Rhapsido 25 mg twice daily for adults with CSU uncontrolled on H1 antihistamines.

The FDA has approved Rhapsido for the treatment of chronic spontaneous urticaria (CSU) in adult patients who remain symptomatic despite H1 antihistamine treatment. The approval is based on two identical, 52-week, randomized, placebo-controlled trials, REMIX-1 and REMIX-2, which enrolled a total of 925 adults with CSU inadequately controlled on H1 antihistamines. Rhapsido is a kinase inhibitor and is not indicated for other forms of urticaria.

In the trials, patients received Rhapsido 25 mg or placebo orally twice daily for 24 weeks. At week 12, Rhapsido demonstrated statistically significant improvements in the co-primary endpoints of weekly itch severity score (ISS7) and weekly hive severity score (HSS7), as well as the key secondary endpoint of weekly urticaria activity score (UAS7), compared with placebo. The recommended dose is 25 mg orally twice daily, swallowed whole. Treatment should be interrupted for 3 to 7 days before and after surgery due to bleeding risk.

+ Clinical Details (Mechanism · Dosing · Trial Data · Warnings)
Mechanism of Action

Rhapsido is a kinase inhibitor. The specific kinase target is not stated in the label.

Indication & Patient Population

Rhapsido is indicated for the treatment of chronic spontaneous urticaria (CSU) in adult patients who remain symptomatic despite H1 antihistamine treatment. Limitations of Use: Rhapsido is not indicated for other forms of urticaria. The clinical trials enrolled adults with CSU diagnosed with itch and hives for at least 6 consecutive weeks and inadequate control on H1 antihistamines, defined as a weekly urticaria activity score (UAS7) of 16 or greater, a weekly itch severity score (ISS7) of 6 or greater, and a weekly hive severity score (HSS7) of 6 or greater.

Dosing & Administration

The recommended dosage is 25 mg taken orally twice daily with or without food. Swallow tablets whole with water. Do not split, crush, or chew. If a dose is missed, skip the missed dose and take the next dose at the regularly scheduled time. Do not take an extra dose to make up for a missed dose. Interrupt Rhapsido for 3 to 7 days pre- and post-surgery depending upon the type of surgery and the risk of bleeding.

Key Clinical Trial Data

Efficacy was evaluated in two identical, 52-week, multicenter, randomized, double-blind, placebo-controlled trials (REMIX-1 and REMIX-2) in 925 adult patients with CSU inadequately controlled on H1 antihistamines. Patients were randomized 2:1 to Rhapsido 25 mg or placebo twice daily for 24 weeks, followed by a 28-week open-label period. Efficacy is based on 912 patients treated during the 24-week controlled period. The co-primary endpoints were absolute change from baseline in ISS7 and HSS7 at Week 12. The key secondary endpoint was absolute change from baseline in UAS7 at Week 12. In REMIX-1, the LS mean difference versus placebo for ISS7 was -2.63 (95% CI -3.70, -1.56), for HSS7 was -3.61 (95% CI -4.85, -2.36), and for UAS7 was -6.22 (95% CI -8.45, -4.00). In REMIX-2, the LS mean difference versus placebo for ISS7 was -3.23 (95% CI -4.29, -2.16), for HSS7 was -4.47 (95% CI -5.71, -3.23), and for UAS7 was -7.68 (95% CI -9.91, -5.46). The proportion of patients with UAS7 of 6 or less at Week 2 was 33.7% versus 3.3% in REMIX-1 and 30.0% versus 5.9% in REMIX-2. All co-primary and secondary endpoints showed statistically significant improvement compared with placebo.

Warnings & Contraindications

Not reported in label.

Place in Therapy

Rhapsido is an oral kinase inhibitor approved for adults with CSU who remain symptomatic despite H1 antihistamine treatment. It is not indicated for other forms of urticaria. The label does not provide information on use after other therapies or comparative efficacy.

The FDA has approved a new drug called Rhapsido for adults with chronic spontaneous urticaria, often called CSU. This is a condition where hives and itching come back for weeks or months without a clear cause. Rhapsido is a kinase inhibitor, a type of medicine that calms part of the immune system. It is taken as a 25 mg pill twice a day, swallowed whole.

Rhapsido is only for adults whose symptoms are not well controlled with H1 antihistamines, the usual first treatment for hives. It is not approved for other types of urticaria. The approval is based on two large, year-long studies called REMIX-1 and REMIX-2. Together, they included 925 adults. At week 12, people taking Rhapsido had less itching and fewer hives than those taking a placebo.

This approval gives patients and doctors another option when antihistamines are not enough. It does not mean Rhapsido works for everyone or replaces standard care. Like all medicines, it has risks. For example, treatment should be paused for 3 to 7 days before and after surgery because of bleeding risk.

If you have ongoing hives, talk with your doctor about whether Rhapsido is right for you. Only a health care professional can decide if this medicine fits your situation.

What this means for you:
Rhapsido is a new FDA-approved pill for adults whose ongoing hives are not controlled by antihistamines.

Study Details

Study typeFda approval
PublishedSep 2025
View Original Abstract ↓
1 INDICATIONS AND USAGE RHAPSIDO ® is indicated for the treatment of chronic spontaneous urticaria (CSU) in adult patients who remain symptomatic despite H1 antihistamine treatment. Limitations of Use: RHAPSIDO is not indicated for other forms of urticaria. RHAPSIDO ® is a kinase inhibitor indicated for the treatment of chronic spontaneous urticaria (CSU) in adult patients who remain symptomatic despite H1 antihistamine treatment. ( 1 ) Limitations of Use: Not indicated for other forms of urticaria. ( 1 )
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