Top of this page
Skip navigation, go straight to the content

 

Glossary

Parallel-group

A type of study design. Participants are put in different groups and take different kinds and/or different amounts of study drug

Placebo

A study drug with no active ingredients

Placebo-controlled

A kind of study design in which some participants receive a placebo (a study drug with no active ingredients)

Psoriasis

A skin disease in which people have red, itchy, and scaly patches on their skin

Psoriatic arthritis

A disease of the body’s defense system that causes inflammation (redness and swelling), pain, and stiffness in the joints, and psoriasis (an itchy, painful skin problem)