Ocular
/ˈɒkjʊlər/
Relating to the eye.
Off-label
/ɒfˈleɪbəl/
Drug use for unapproved indications.
Ointment
/ˈɔɪntmənt/
Oily preparation rubbed on skin.
Oliguria
/ˌɒlɪˈɡjʊəriə/
Small amounts of urine production.
Oncology
/ɒŋˈkɒlədʒi/
Study and treatment of cancer.
Onset of action
/ˈɒnsɛt əv ˈækʃən/
Time for drug effects to start.
Ophthalmic
/ɒfˈθælmɪk/
Relating to eye drops/diseases.
Opioid
/ˈoʊpioɪd/
Compound resembling opium properties.
Opportunistic infection
/ˌɒpərtjuːˈnɪstɪk ɪnˈfɛkʃən/
Infection in immune-weakened host.
Optimum
/ˈɒptɪməm/
Most favorable level for therapy.
Oral
/ˈɔːrəl/
Administration by mouth.
Orphan drug
/ˈɔːrfən drʌɡ/
Drug for rare medical conditions.
Orthostatic hypotension
/ˌɔːrθəˈstætɪk ˌhaɪpoʊˈtɛnʃən/
BP drop upon standing up.
Osmosis
/ɒzˈmoʊsɪs/
Solvent passage through semipermeable membrane.
Ototoxicity
/ˌoʊtoʊtɒkˈsɪsɪti/
Toxicity to the ear/auditory nerve.
Over-the-counter
/ˌoʊvərðəˈkaʊntər/
Medicines sold without prescription.
Oxidation
/ˌɒksɪˈdeɪʃən/
Loss of electrons in drug metabolism.