New drug BLKR201 put to the test in healthy volunteers

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Are a healthy man or woman 18 to 55 years old * Weigh at least 50 kilograms (110 pounds) * Have a body mass index (BMI) between 18 and 30 kg/m2 (inclusive) * Are willing to stay at the research unit for the required study visits * Are willing to follow study rules about diet, alcohol, tobacco, and medications * Are able to understand and sign the informed consent form Women who can become pregnant must: * Have a negative pregnancy test before starting * Use a highly effective form of birth control during the study and for a period after the last dose Men with partners who can become pregnant must: * Use highly effective birth control during the study and for a period after the last dose * Not donate sperm during that time Exclusion Criteria: * Have any significant medical condition involving the heart, lungs, liver, kidneys, stomach, intestines, brain, blood, or immune system * Have abnormal laboratory test results at screening that the study doctor considers important * Have a history of heart rhythm problems or abnormal electrocardiogram (ECG) results * Have high blood pressure at screening * Have had a serious infection within the past 6 months * Test positive for HIV, hepatitis B, hepatitis C, or tuberculosis, or show evidence of hepatitis B infection (positive hepatitis B surface antigen or hepatitis B core antibody). Note: participants with hepatitis B immunity from vaccination alone may still be eligible. * Have a history of cancer in the past 5 years (with limited exceptions for certain treated skin cancers) * Have a history of serious stomach problems such as ulcers, stomach surgery, or stomach bleeding * Use tobacco, nicotine, or marijuana products * Test positive for drugs or alcohol at screening * Have taken another investigational drug within the required time before this study * Have received a live vaccine within 30 days before study start * Are pregnant or breastfeeding * Have a known allergy to the study drug or similar medicines Additional exclusions: * Regular heavy alcohol use * Regular use of certain medications such as anti-inflammatory drugs, steroids, or blood thinners * Donation of more than 500 milliliters (about one pint) of blood within 1 month before screening For the spinal fluid (CSF) portion of the study, you cannot take part if you: * Take blood-thinning medications * Have bleeding or clotting problems * Have sensitivity to lidocaine, band aids, adhesive dressing, or medical tape * Have medical conditions that make a spinal tap unsafe