Bobby Caldwell, the king of “blue-eyed soul,” has passed away at the age of 71.

The news was announced on Caldwell’s Twitter page by his wife Mary. She wrote, “Bobby passed away here at home. I held him tight in my arms as he left us. I am forever heartbroken. Thanks to all of you for your many prayers over the years. He had been ‘FLOXED,’ it took his health over the last 6 years and 2 months. Rest with God, my Love.”

According to medical research site MDPI, the term “floxed” stands for “Fluoroquinolones toxicity syndrome” or “Fluoroquinolones associated disability.” This occurs when Fluoroquinolones (or FQs) are prescribed to a patient to treat infections such as urinary tract infections, bacterial gastroenteritis, bacterial bronchitis, or other diseases, but experience severe, but rare side effects that can affect patients for long periods of time, or even their entire life.

FQs are one of the most common antibiotics prescribed to patients today, particularly those over 45. MDPI’s research finds that 19/9 percent of all FQ prescriptions “were prescirbed for conditions outside the suggested administration protocol.”

TMZ reports that Caldwell had not been able to walk for around five years and suffered from painful neuropathy and a torn ankle tendon. Caldwell’s team said last year that Caldwell had been prescribed an antibiotic in 2017, leading him to have a poor reaction, including causing his Achilles tendon to rupture, causing the neuropathy.

Caldwell burst onto the mainstream music scene in 1978 with his hit, “What You Won’t Do For Love.” He also had other hits, including “Open Your Eyes,” “Coming Down from Love,” “My Flame” and more.