These providers work in specialty clinics and may specialize in areas like Palliative Care, Pulmonary, Infectious Disease, Endocrinology, Gastroenterology, Cardiology, Dermatology, Urology, Nephrology, Neurology, Hematology, Oncology, Allergy and Immunology, Rheumatology, or other medical specialties. Counsels patients about drug regimens and possible side effects or interactions with food supplements, over-the-counter medications, and herbal remedies.