- Nabumetone
- Nadolol
- Nadroparin
- Naegleria fowleri meningoencephalitis
- Naftifine
- Naftin
- Nail disorders, miscellaneous
- Nails, discolored or thick
- Nails, distorted
- Nalfon
- Naprosyn
- Naproxen
- Narcissistic disorder
- Narcolepsy
- Narcotic addiction
- Nardil
- Nasal deformity or saddle nose
- Nasal polyps
- Nasal trauma
- Nasal tumors
- NASH (nonalcoholic steatohepatitis)
- Natacyn
- Natamycin 5% suspension
- Nateglinide
- National Cholesterol Education Program (NCEP) report
- Natural family planning, symptothermal
- Nausea
- Navane
- NCEP Adult Treatment Panel III Report
- Necator americanus
- Neck cancer
- Neck mass
- Neck pain
- Neck pain, discogenic
- Neck stiffness
- Necrolysis, toxic epidermal
- Necrophilia
- Necrotizing ulcerative gingivitis
- Nedocromil
- Nefazodone
- Neighborhood reaction, cerebrospinal fluid in
- Neisseria gonorrhoeae
- Neisseria meningitidis
- Nelfinavir
- Neoplasms (neoplasia)
- Nephritic syndromes, classification and findings in
- Nephritis
- Nephrolithiasis
- Nephropathy
- Nephrotic syndrome
- Neumega (IL-11)
- Neuralgia
- Neural hearing loss
- Neurinoma, acoustic
- Neuritic headache
- Neuroblastoma, treatment of
- Neurocysticercosis
- Neurodermatitis, circumscribed
- Neurofibromas, spinal cord
- Neurogenic arthropathy
- Neurogenic bladder
- Neuroimaging, for acute headache
- Neuroleptic malignant syndrome
- Neurologic testing, of lumbosacral nerve disorders
- Neuroma, acoustic
- Neuronal antagonists, peripheral
- Neuron disease, motor
- Neuronitis, vestibular
- Neuropathic arthropathy
- Neuropathies
- Neurosyphilis
- Neutrogena
- Neutrons, radiation reactions from
- Neutropenia
- Neutropenia, infection prevention
- Neutropenic fever of undetermined origin
- Neutrophilia
- Nevi
- Nevi, congenital
- Nevi, dysplastic
- Nevirapine
- Newborn, hemolytic disease in
- Niacin deficiency
- Nicardipine
- Nicotine, in breast-feeding women
- Nifedipine
- Nightmares
- Nilutamide
- Nimodipine overdose
- Nipple discharge
- Nipple or areolar lesions
- Nipride
- Nisoldipine
- Nitroglycerin
- Nitroprusside
- NNRTIs
- Nocardia
- Nocardia, actinomycetoma from
- Nocardia, drugs for
- Nocardiosis
- Noctec
- Nocturia
- Nocturnal myoclonus
- Nodular, cystic lesions
- Nodule, pulmonary
- Nodule, subcutaneous
- Nodule, thyroid
- Nonalcoholic fatty liver disease
- Nonalcoholic steatohepatitis (NASH)
- Nonampullary adenocarcinoma, of small intestine
- Nonconvulsive status epilepticus
- Nongonococcal acute bacterial arthritis
- Non-Hodgkin's lymphoma
- Non-Hodgkin's lymphoma, of small intestine
- Nonnucleoside reverse transcriptase inhibitors (NNRTIs)
- Non-penicillinase-producing staphylococcus, drugs for
- Non-small cell lung cancer (NSCLC)
- Nonspecific interstitial pneumonitis
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Nontuberculous mycobacteria (NTM), pulmonary infections from
- Nontuberculous mycobacterial lymphadenitis
- Norethindrone
- Norethindrone acetate
- Norgestimate
- Norgestrel
- Normodyne
- Norpramin
- Nortriptyline
- Norvasc (amlodipine)
- Norvir
- Norwalk virus, gastroenteritis from
- Nosebleed
- Nosocomial fever
- Nosocomial infection
- Nosocomial pneumonia
- Novolin
- Novolog
- Novo Nordisk
- NPH Humulin
- NPH Iletin
- NPH insulin preparations
- NPH Novolin
- NSAIDs
- Nucleoside analogs
- Nucleotide analog
- Nucleus pulposus, herniated
- Numorphan
- Nutritional deficiencies in elderly
- Nylen-Béaréany
- Nystagmus