This study checks how well a drug called tildrakizumab works for people with psoriatic arthritis, a condition causing joint pain and skin rashes. Tildrakizumab is compared to a placebo, which looks like the real drug but has no medicine in it. The study is *double-blind*, meaning neither doctors nor patients know who gets the real drug. To join, you must be 18 or older and have used certain arthritis medicines before. You can't join if you have recent serious infections, heart problems, or certain other health issues.
- The study lasts 24 weeks.
- You must not have any planned surgeries during the study.
- Make sure to use birth control if you're of childbearing age.