@windyshores and @daliea, I'm glad that you both figured out the confusion of drug names and purposes.

For others reading this discussion, I offer this clarification, correct spellings and links to further information.
Durolane (brand name) is sodium hyaluronate (injection) used to treat knee pain caused by osteoarthritis. Durolane is similar to the fluid that surrounds the joints in your body. This fluid acts as a lubricant and shock absorber for the joints. https://www.drugs.com/mtm/durolane-injection.html

Cymbalta (brand name) or duloxetine (generic name) is a selective serotonin and norepinephrine reuptake inhibitor antidepressant (SSNRI). Duloxetine affects chemicals in the brain that may be unbalanced in people with depression. https://www.drugs.com/cymbalta.html