Takeda Pharmaceutical Company Limited

The liver produces a protein called alpha-1 antitrypsin (AAT). AAT is normally released into the bloodstream. In some people, the liver makes an abnormal version of the AAT protein, called Z-AAT. Making an abnormal version of the AAT protein can result in liver disease as Z-AAT builds up in liver cells, which leads to liver problems such as liver scarring (fibrosis), continuing liver damage (cirrhosis), and eventually end stage liver disease. Fazirsiran is a medicine that reduces the creation of the Z-AAT protein and thus the build-up of this abnormal protein in the liver. People with this type of liver disease who already have mild liver scarring will take part in the study. They will be treated with fazirsiran or a placebo for about 2 years. This study will check the long-term safety of fazirsiran, whether participants tolerate the treatment and if there are any effects on liver scarring. A liver biopsy, a way of collecting a small tissue sample from the liver, will be taken twice during the study. After their last clinic visits, participants will have two choices: 1. They can complete this study and return to the clinic 3 and 6 months later so the study doctors can check for side effects; OR 2. If they meet the rules, they can join another study (called extension or continuation study), in which they will receive fazirsiran every 3 months and will continue to have health checks.Show more

This is a multi-arm phase II platform-basket screening study designed to test multiple experimental therapies simultaneously in patients with NF2-related schwannomatosis (NF2-SWN, formerly known as neurofibromatosis type 2) with associated progressive tumors of vestibular schwannomas (VS), non-vestibular schwannomas (non-VS), meningiomas, and ependymomas. This Master Study is being conducted as a "basket" study that may allow people with multiple tumor types associated with NF2-SWN to receive new drugs throughout this study. Embedded within the Master Study are individual drug substudies. * Investigational Drug Sub-study A: Brigatinib * Investigational Drug Sub-study B: Neratinib * Investigational Drug Sub-study C: Retifanlimab plus bevacizumabShow more

The Myelin Disorders Biorepository Project (MDBP) seeks to collect and analyze clinical data and biological samples from leukodystrophy patients worldwide to support ongoing and future research projects. The MDBP is one of the world's largest leukodystrophy biorepositories, having enrolled nearly 2,000 affected individuals since it was launched over a decade ago. Researchers working in the biorepository hope to use these materials to uncover new genetic etiologies for various leukodystrophies, develop biomarkers for use in future clinical trials, and better understand the natural history of these disorders. The knowledge gained from these efforts may help improve the diagnostic tools and treatment options available to patients in the future.Show more

Congenital thrombotic thrombocytopenic purpura (cTTP) is a rare blood disorder that some people are born with. It is caused by a problem in a gene passed down from parents to children, which affects the body's ability to produce a enzyme called ADAMTS13. This enzyme helps to cut down a larger form of protein called von Willebrand Factor (VWF). People with cTTP have low levels of ADAMTS13. Without ADAMTS13, large forms of vWF build up and cause blood clots in small blood vessels. These clots can block blood flow to vital organs, causing serious health problems. Adzynma is a human ADAMTS13 protein made in the laboratory. It works the same way as natural ADAMTS13 does and may provide higher levels of ADAMTS13. The main aim of this study is to learn more about the risk of children and adults with cTTP treated with Adzynma developing antibodies that prevent Adzynma from working properly (called neutralizing antibodies) within 6 months after the first treatment and to understand the risk of allergic reactions within 7 days of the first treatment with Adzynma. Other aims are to better understand how safe treatment with Adzynma is over a longer period of time (called long-term safety) in children and adults with cTTP and to gather information about pregnancies and babies of women who have received Adzynma while pregnant. Only data already available in the medical records of the people who received Adzynma for the treatment of cTTP in normal clinical practice will be reviewed and collected during this study.Show more

The main aim of this study is to find out how well elritercept works in lowering the need for RBC transfusions. Other aims are to learn how well elritercept works in reducing the need for RBC transfusions over longer periods of time or in adults with high transfusion needs. The study will also check on how safe elritercept is and how well it is tolerated.Show more

The main aim of this study is to find out how well elritercept works to improve anemia in participants with myelofibrosis (MF) who are taking ruxolitinib when compared to placebo. Other aims are to learn how elritercept improves anemia compared to placebo; to learn if elritercept reduces tiredness, improves symptoms related to MF, and helps participants do physical activities more easily. The study also aims to find out how elritercept affects the bone marrow, the spleen, and whether participants develop antibodies to the study drug. The study will also check how safe elritercept is compared to placebo, and if elritercept stays safe over a long period of time. Participants will receive study treatment for at least 9 months (36 weeks). After this period, participants who received placebo will have the option to switch to elritercept.Show more

The main aim of this study is to assess how much elritercept reduces the need for RBC (red blood cell) transfusions and improves hemoglobin blood values in addition to how safe elritercept is when compared with epoetin alfa. Other key aims are to learn how much elritercept improves tiredness and quality of life as reported by participants compared with epoetin alfa; to assess what risks (side effects) and how often they occur with elritercept compared with epoetin alfa. The study will also collect information for researchers to see how the disease in the bone marrow or other body areas may be affected by elritercept compared with epoetin alfa to try to learn how to better treat this disease.Show more

Central hypersomnia conditions are a group of sleeping disorders where the brain has trouble keeping a person awake during the day (called excessive daytime sleepiness or EDS). These conditions usually include narcolepsy (type 1 and 2) and idiopathic hypersomnia (IH). Narcolepsy type 1 (NT1) includes sudden muscle weakness while you stay awake, called cataplexy, often triggered by strong emotions. Narcolepsy type 2 (NT2) does not include cataplexy. People with narcolepsy typically feel refreshed by short naps. People with IH feel extremely sleepy during the day, and do not feel refreshed by sleep. Waking up from sleep is difficult. This is common in the morning and also when waking up from long naps. The study wants to learn about TAK-360 when taken over a long time period; this is called a long-term extension or LTE study. The main aim of this LTE study is to find out how well participants with NT1, NT2, and IH tolerate TAK-360 over a longer period (long-term tolerability) and to learn how safe TAK-360 is when given over a longer period of time (long-term safety). Participants who completed one of the TAK-360 parent studies can join this study if they meet the study rules. Parent studies include TAK-360-2001(NCT06952699), TAK-360-2002 (NCT06812078), or other TAK-360 studies that evaluate the TAK-360 medicine. All participants will receive TAK-360 in this study. They will either receive the same dose as they did in the parent study, or the closest dose available in this LTE study. Participants who received placebo (the placebo looks just like TAK-360 but does not have any medicine in it) in their parent study will receive one of the TAK-360 doses available in this study. Placebo will only be used to not reveal the dose of TAK-360 from parent studies to investigator, participants, and sponsor. Sponsor, investigators and participants will not know which TAK-360 dose was used in the LTE study as long as the parent study is ongoing. The participants will have to visit the clinic multiple times during this study.Show more

Takeda Pharmaceutical Company Limited has 28 FDA-approved drugs with a rare disease use that we track, as of November 2026.

Firazyr (icatibant), approved 2011: Hereditary Angioedema.

Mimrylo (rusfertide), approved 2026: Polycythemia Vera.

Orzeyful (oveporexton), approved 2026: Narcolepsy Type 1.

Adzynma (adamts13, recombinant-krhn), approved 2023: Thrombotic Thrombocytopenic Purpura.

VPRIV (velaglucerase alfa), approved 2010: Gaucher Disease.

Elaprase (idursulfase), approved 2006: Hunter Syndrome.

Gattex (teduglutide), approved 2012: Short Bowel Syndrome.

Takhzyro (lanadelumab), approved 2018: Hereditary Angioedema.

And 20 more: see the FDA-approved drugs section on this page.

Source: the FDA's openFDA label database, matched to the rare diseases on Trial Friend; the list updates automatically and can include older products.

Yes, for 9 of its FDA-approved rare disease medicines that we track, each checked on Takeda Pharmaceutical Company Limited's own website.

Firazyr: Takeda Patient Support, 1-866-888-0660. Offers copay help with private insurance and insurance help. Checked October 24, 2026.

Mimrylo: MIMRYLO Patient Support (Takeda Oncology Here2Assist), 1-844-817-6468. Offers copay help with private insurance and a free medicine program. Checked September 29, 2026.

Adzynma: Takeda Hematology Support Center, 1-888-229-8379. Offers copay help with private insurance and insurance help. Checked October 12, 2026.

VPRIV: Takeda Patient Support, 1-866-888-0660. Offers copay help with private insurance, a short-term supply while insurance is decided and insurance help. Checked September 24, 2026.

Elaprase: Takeda Patient Support, 1-866-888-0660. Offers copay help with private insurance and insurance help. Checked September 24, 2026.

Gattex: Takeda Patient Support, 1-866-888-0660. Offers copay help with private insurance and insurance help. Checked November 13, 2026.

The other 3 are on the help paying page.

Medicare and Medicaid: drugmaker copay cards are limited to private insurance, so people with government coverage usually look to a free medicine program or a charity fund, both on the help paying page.

Eligibility is decided by each program, so call the number listed before a prescription is filled.