ARESTIN® (minocycline HCl) Microspheres, 1 mg is a concentrated, locally applied antibiotic that remains active in the pocket for an extended period of time to reduce pocket depth.1 The microspheres release antibiotic over time, targeting bacteria to reduce pocket depth, so gums can heal better than with scaling and root planing (SRP) alone.

Source: https://www.arestinprofessional.com/why-arestin