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Quetiapine fumarate is a prescription atypical antipsychotic. Selected UK products are licensed for schizophrenia and bipolar disorder; Biquelle XL is also licensed as add-on treatment for major depressive disorder when an antidepressant alone has not worked adequately.
Quinagolide hydrochloride is a non-ergot dopamine D2-receptor agonist that reduces prolactin release from the pituitary gland. It is used for hyperprolactinaemia that is idiopathic or caused by a prolactin-secreting pituitary adenoma.
Quinine bisulfate is a prescription antimalarial alkaloid. The selected product is licensed for falciparum malaria and for selected adults with night-time leg cramps that regularly disrupt sleep; it is not a routine treatment for leg cramps.
Quinine sulfate is a prescription-only cinchona alkaloid used for falciparum malaria. It may also be considered for nocturnal leg cramps that regularly disrupt sleep, but is not a routine cramp treatment because benefit is modest and serious adverse effects can occur.
Quizartinib dihydrochloride is an oral protein kinase inhibitor used for adults with newly diagnosed acute myeloid leukaemia whose cancer has the FLT3-ITD alteration. It is used with chemotherapy and may then continue as maintenance treatment.