A Study to Evaluate Efficacy and Safety of MK-8690 in Participants With Moderately to Severely Active Ulcerative Colitis (MK-8690-002)

To be considered for this study, you need to be an adult between 18 and 75 years old and have been diagnosed with ulcerative colitis for at least three months. Your ulcerative colitis should currently be active, meaning you're experiencing symptoms that are moderate to severe. It's also important that you weigh at least 40 kg (about 6 stone 4 pounds).

Doctors will also look at your past treatments. You might be eligible if your previous treatments for ulcerative colitis haven't worked well, stopped working, or if you couldn't tolerate them because of side effects. You could also be considered if you rely on certain steroid medications for your condition.

However, there are some reasons why you wouldn't be able to join. For example, if you have Crohn's disease instead of ulcerative colitis, or if your ulcerative colitis is very severe (like fulminant colitis) or only affects the very end of your bowel (rectum). If you have other serious health conditions, certain infections like hepatitis B, C, or HIV, or a history of cancer within the last five years (except for certain treated skin cancers), you might not be able to participate. Also, if you've had major bowel surgery or plan to have one soon, you wouldn't be eligible.

If you decide to take part in this study, you will be given either the new medicine, MK-8690, or a placebo (a dummy medicine). You won't know which one you are taking. You will have regular visits to the clinic where doctors and nurses will check your health, assess your symptoms, and take blood samples. These visits will help the research team monitor how you are responding to the treatment and ensure your safety. There will also be follow-up checks after your main treatment period. The total time you would be involved in the study is not specified in detail here, but these types of studies typically involve several months of regular checks and medication.