- Prion
- Prion diseases
- Prion protein
- Prions
- Prioritization
- Priority review
- Prism adaptation
- Prism cover test
- Prisoner's dilemma
- Pristane
- Pristanic acid
- Pristinamycin
- Pristinamycin IA
- Privacy for research participants
- Private duty nursing
- Private speech
- Pro re nata
- Pro-oxidants
- Proadifen
- Proanthocyanidin
- Proarrhythmia
- Probability sample
- Proband
- Probenecid
- Probes
- Probiotics
- Problem formulation
- Problem solving
- Problem-based learning
- Problem-focused coping
- Problematic social media use
- Proboscis
- Probucol
- Procainamide
- Procaine
- Procalcitonin
- Procarbazine
- Procaterol
- Procedural knowledge
- Procedural memory
- Procedure codes
- Procerus
- Procerus muscle
- Process development
- Process flow diagrams
- Process safety
- Processed meat
- Processing
- Processing fluency
- Processing speed
- Processus vaginalis
- Prochlorperazine
- Procidentia
- Procoagulant
- Procollagen
- Procrastination
- Proctalgia
- Proctitis
- Proctocolectomy
- Proctocolitis
- Proctodeal
- Proctodeum
- Proctoscope
- Proctoscopy
- Procyanidin
- Procyanidin A1
- Procyanidin B1
- Procyanidin B2
- Procyanidin B3
- Procyanidin dimer
- Procyclidine
- Procymidone
- Prodigiosin
- Prodrome
- Prodrugs
- Product
- Product inhibition
- Products of conception
- Prodynorphin
- Proenkephalin
- Proerythroblast
- Proestrus
- Professional boundaries
- Professional conduct
- Professional development
- Professional misconduct
- Professional responsibility
- Profile of Mood States
- Profilin
- Profiling
- Proflavine
- Profunda brachii artery
- Profunda femoris artery
- Progabide
- Progastrin
- Progeny
- Progeria
- Progerin
- Progesterone
- Progesterone receptor
- Progesterone receptor A
- Progesterone receptor B
- Progesterone receptors
- Progestin
- Progestogen
- Progestogen-only contraception
- Progestogen-only pill
- Progestogens
- Proglucagon
- Proglumide
- Prognathism
- Prognosis
- Prognosis marker
- Prognostication
- Program of All-Inclusive Care for the Elderly
- Programmed cell death
- Programmed cell death 1
- Progress notes
- Progression free survival
- Progressive bulbar palsy
- Progressive cardiac conduction defect
- Progressive disease
- Progressive disseminated histoplasmosis
- Progressive familial intrahepatic cholestasis
- Progressive lenses
- Progressive massive fibrosis
- Progressive muscle relaxation
- Progressive muscular atrophy
- Progressive myoclonus epilepsy
- Progressive nonfluent aphasia
- Progressive osseous heteroplasia
- Progressive overload
- Progressive supranuclear palsy
- Progressive systemic sclerosis
- Progressive vaccinia
- Proguanil
- Prohibitin
- Proinflammatory cytokines
- Proinsulin
- Projection fibers
- Projection neurons
- Projective tests
- Prokaryotes
- Prokaryotic cell
- Prokaryotic cells
- Prokinetic agent
- Prokineticin
- Prokineticin receptor
- Prokinetics
- Prolactin