Minocin MR is a brand name for the antibiotic minocycline, which is used to treat a variety of bacterial infections. It belongs to the tetracycline class of antibiotics and works by inhibiting the growth and spread of bacteria, allowing the body's immune system to destroy them. Minocin MR is specifically formulated as a modified-release (MR) capsule, designed to release the medication into the body more slowly, which can help in maintaining a consistent level of the drug in the bloodstream and potentially reduce side effects. It is commonly prescribed for conditions such as acne, respiratory infections, urinary tract infections, and certain sexually transmitted infections, among others. As with any antibiotic, it's important to complete the full course as prescribed to avoid the development of antibiotic-resistant bacteria.