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CZTL capsule therapy study design for acute ischemic stroke patients not eligible for IVT or with early deteriorationNew Stroke Pill Could Help Patients Missed by Standard Care

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Key Takeaway
Note that this publication reports only the study rationale and design for CZTL therapy in acute ischemic stroke.

The study was a randomized, double-blind, placebo-controlled, multicenter clinical study involving 1,208 eligible participants with acute ischemic stroke. The setting included approximately 70 stroke centers in China. The population comprised patients not eligible for intravenous thrombolysis (IVT) or those experiencing early neurological deterioration after IVT.

The intervention was CZTL capsule therapy compared with placebo. The primary outcome was excellent functional outcome, defined as a score of 0 or 1 on the modified Rankin Scale (mRS) at 90 days. Secondary outcomes included 90-day mortality and symptomatic intracranial hemorrhage within 48 hours.

No main results were reported in this publication, which was classified as a study rationale and design. Safety data, including adverse events, serious adverse events, discontinuations, and tolerability, were not reported. Limitations and funding or conflicts of interest were not reported.

Because this document describes the study rationale and design rather than completed results, the clinical relevance regarding efficacy or safety remains uncertain. The follow-up duration was 90 days.

Doctors usually use a drug to dissolve clots. But it only works within a short time window. Many people are left without effective help.

This new treatment targets a different problem. It aims to protect the brain even after the clot is gone. Sometimes, blood flow causes more damage when it returns.

The surprising shift

Think of the brain like a garden. Stroke cuts off the water supply. This medicine acts like a shield against the damage.

It is based on traditional Chinese medicine. Scientists are testing if it works like modern drugs. They call it Chuanzhi Tongluo.

How the medicine protects

The CONCERN trial involves over 1,200 people. They will take the pill or a fake one for three months. It is happening across many hospitals in China.

Neither the doctors nor the patients know who gets the real pill. This is called a double-blind study. It helps remove bias from the results.

What the study is testing

The researchers have set clear goals for success. They want to see if patients walk better after three months. They will also watch for safety risks like bleeding.

Success means a patient has no disability or slight disability. This is measured by a simple score given to patients. It focuses on daily life, not just brain scans.

What the study is testing

This doesn’t mean this treatment is available yet.

Experts say testing old medicines in new ways is smart. It bridges history with modern science. This approach respects tradition while demanding proof.

Many traditional remedies fail in modern trials. This study uses strict rules to ensure safety. It sets a high bar for approval.

Bridging old and new science

Do not start taking this on your own. Wait for official approval from health agencies. Talk to your doctor about current options.

If you see stroke signs, call emergency services immediately. Do not wait for new pills to arrive. Standard care is still the best option today.

What you should do now

The study is happening in China. Results might differ in other countries. It is still in the early stages of testing.

The participants are all from specific hospitals. This limits how well the results apply everywhere. We need more global data to be sure.

Limitations to keep in mind

Next steps involve more testing and global reviews. Approval could take several more years. We must wait for the final data.

If it works, it could change care for thousands. But science moves slowly to keep people safe. Patience is key for new medical advances.

Study Details

Study typeRct
EvidenceLevel 2
PublishedApr 2026
View Original Abstract ↓
Abstract Background: Acute ischemic stroke (AIS) remains a significant cause of disability worldwide. Current treatments, primarily intravenous thrombolysis (IVT), are limited by narrow time windows and reperfusion injury, leading to suboptimal outcomes for many patients. Chuanzhi Tongluo (CZTL), a traditional Chinese medicine, has been preliminarily recognized as a novel cerebral protection agent in animal models. Objectives: This trial investigates the efficacy and safety of CZTL capsule in patients with AIS who are not eligible for IVT or who experience early neurological deterioration after IVT. Methods and design: The CONCERN trial is an investigator-initiated, prospective, multicenter, double-blind, parallel-control, randomized clinical study in China. An estimated 1,208 eligible participants will be consecutively randomized to receive CZTL capsule therapy or placebo in 1:1 ratio across approximately 70 stroke centers in China. All enrolled patients are orally administered 2 capsules of CZTL or placebo 3 times a day together with antiplatelet agents for 3 months. Outcomes: The primary endpoint is an excellent functional outcome, defined as a score of 0 or 1 on the mRS at 90 days. Lead safety endpoints included 90-day mortality and symptomatic intracranial hemorrhage within 48 hours. Conclusions: Results of CONCERN trial will determine the clinical efficacy and safety of the traditional Chinese medicine CZTL capsule in the treatment of AIS patients. Trial registry number: ChiCTR2300074147 (www.chictr.org.cn).
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