- N-acetylcysteine, for acetaminophen overdose
- nadolol
- Naegleria
- nafcillin
- nail lesions
- naloxone
- naltrexone
- naltrexone/bupropion, for obesity
- naproxen
- naratriptan, for migraine
- narcissistic personality disorder
- narcolepsy
- narcotics
- nasopharyngeal cancer, Epstein-Barr virus in
- natalizumab
- nateglinide, for diabetes mellitus
- native valve endocarditis (NVE)
- nausea and vomiting
- NBTE (nonbacterial thrombotic endocarditis)
- Necator americanus infections
- neck cancer: see head and neck cancer
- neck pain
- neck weakness
- necrotizing fasciitis
- necrotizing myelopathy
- nedocromil sodium, for asthma
- nefazodone
- Negri body
- Neisseria gonorrhoeae infections: see gonorrhea
- Neisseria meningitidis infections: see meningococcal infections
- nematocysts
- nematode infections
- neoehrlichiosis
- neomycin, for hepatic encephalopathy
- neonatal disease
- nephrectomy
- nephritic syndrome
- nephritis
- nephrolithiasis
- nephropathy
- nephrostomy tube
- nephrotic syndrome (NS)
- nerve abscess, in leprosy
- nervous system tumors
- nesiritide
- neuralgia
- neuraminidase inhibitors, for influenza
- neurasthenia
- neurocysticercosis
- neurogenic shock
- neuroleptic malignant syndrome (NMS)
- neuroleptics, for delirium
- neurologic disease
- neurologic examination
- neuromodulation, for migraine
- neuromuscular blockers
- neuromuscular junction disorders
- neuromyelitis optica (NMO)
- neuropathic pain
- neuropathy: see specific types
- neuroprotection, for stroke
- neurosyphilis
- neutropenia
- neutrophilia
- nevirapine, for HIV infection
- niacin deficiency
- nicardipine, for malignant hypertension
- nicotine, for inflammatory bowel disease
- nicotine addiction
- nicotine replacement therapy
- nifedipine
- nifurtimox
- nilotinib, for CML
- nimodipine, for subarachnoid hemorrhage with vasospasm
- NIPPV (noninvasive positive pressure ventilation)
- Nissen fundoplication
- nitazoxanide
- nitrates
- nitrofurantoin
- nitrogen balance
- nitroglycerin
- nitroimidazoles, for H. pylori eradication
- nitroprusside
- nits
- NIV (noninvasive ventilation)
- nivolumab
- NMO: see neuromyelitis optica (NMO)
- NMS (neuroleptic malignant syndrome)
- nocardiosis
- nodule (skin lesion)
- noma
- nonbacterial thrombotic endocarditis (NBTE)
- non-Hodgkin's lymphoma
- noninvasive positive pressure ventilation (NIPPV)
- noninvasive vagus nerve stimulation, for migraine
- noninvasive ventilation (NIV)
- nonnucleoside reverse transcriptase inhibitors, for HIV infection
- nonpolyposis syndrome (Lynch's syndrome)
- nonseminoma germ cell tumor
- nonspecific interstitial pneumonia
- non-ST-elevation myocardial infarction: see unstable angina/non-ST-elevation myocardial infarction
- nonsteroidal anti-inflammatory drugs (NSAIDs)
- nontuberculous mycobacterial (NTM) infections
- nontyphoidal salmonellosis
- norepinephrine
- normal-pressure hydrocephalus (NPH)
- norovirus infections
- nortriptyline
- nosocomial infections: see health care-associated infections
- NS: see nephrotic syndrome
- NSAIDs: see nonsteroidal anti-inflammatory drugs
- NSTEMI: see unstable angina/non-ST-elevation myocardial infarction
- NTM infections: see nontuberculous mycobacterial infections
- nuclear cardiology
- nuclear medicine imaging, in respiratory disease
- nuclear myocardial perfusion assessment
- nucleoside/nucleotide analogues, for HIV infection
- nummular lesion
- nutcracker esophagus
- nutrients, absorption of
- nutrition
- nutritional status, assessment of
- nutritional support
- NVE: see native valve endocarditis
- nystagmus
- nystatin, for candidiasis