Minocycline is an antibiotic that belongs to the tetracycline class of medications. It is commonly used to treat various bacterial infections, including acne, respiratory infections, and skin infections. Minocycline works by inhibiting the growth of bacteria, helping the body's immune system to eliminate the infection. This medication is usually taken orally in the form of capsules or tablets. Common side effects may include dizziness, nausea, and skin discoloration. It is important to take minocycline as prescribed by a healthcare professional and to complete the full course of treatment to prevent antibiotic resistance.