Are there any drug intereactions of Instaflex with Vivelle Dot, Lovaza or Zetia? ## Instaflex is an over the counter supplement that's used to aid with joint health and mobility. They have several different formulations, but most contain Glucosamine and MSM as the base ingredients, then some herbal supplements, as well. Learn more dietary supplement details here. However, as a supplement, it has not been tested for possible interactions with prescription medications, because those types of studies aren't required to be done for it. The best suggestion I could make would be to double check with your pharmacist, before taking it. What condition are you trying to treat with it? ## My sister has arthritis in her knees, she uses a cane.. she's also 72 years old. She doesn't t...