Has anyone taken Biologics?

I'm somewhat new to asthma and lung problems. In December, I had my first visit with a pulmonologist who prescribed a steroid inhaler and an Aerobika. They were helpful; however, there were still times when these did not work as well as I expected. Six months later, during my follow-up appointment, the pulmonologist added Singulair, which has also been helpful. He did mention he was considering prescribing a biologic.

I'm still having times when all of the previous treatments are not effective, and I'm going to the ER or urgent care for a breathing treatment and Prednisone; I'm probably going to be discussing biologics at my next appointment. If you have been prescribed biologics, please share your experiences.