What is Quinine Quinine is an alkaloid that occurs naturally in the bark of the cinchona tree. The benefits of cinchona bark were first recognized in 1630 in South America, where cinchona is indigenous to certain regions. By 1640 it was introduced into Spain for the treatment of fever. The early use of quinine for …
What is Quinidine Quinidine is a natural alkaloid prepared from cinchona bark and is the optical isomer of quinine. Both drugs are effective antimalarial agents, and, in some parts of the world, quinidine is actually superior. Quinidine is considered to be the prototypical antiarrhythmic agent. As early as 1749, it was noted that administering quinine …
What is Quinapril Quinapril is an oral angiotensin-converting enzyme (ACE) inhibitor used in the treatment of hypertension and heart failure. Similar to ramipril, quinapril is a prodrug that requires deesterification to the active metabolite quinaprilat. Quinaprilat is threefold more potent than the parent compound. Quinapril may be dosed once or twice daily when used for …
What is Quetiapine Quetiapine is an atypical antipsychotic structurally similar to clozapine, a dibenzodiazepine antipsychotic. Atypical antipsychotics, also known as second generation antipsychotics (SGAs), are considered to be the standard of care for schizophrenia and related disorders, and may be considered as first-line treatment options for the management of psychosis (with the exception of clozapine). …
What is Quinacrine NOTE: This drug is discontinued in the US. Quinacrine is an oral antiprotozoal agent used most commonly in the treatment of giardiasis. During World War II, quinacrine was effectively and widely used as an antimalarial agent. It also has been used in the treatment of cestodiasis. More recently, quinacrine has been replaced …
What is Quazepam Quazepam is a long-acting oral benzodiazepine used for the short-term treatment of insomnia. It has been shown to be effective in both sleep laboratory studies and larger clinical trials. The clinical data collected from sleep laboratory studies support the subjective effects reported by patients, which indicate increased quality as well as quantity …
What is Witch Hazel Witch hazel, Hamamelis virginiana, is a botanical astringent agent commonly found in dermatological preparations and anorectal preparations. Astringent agents are commonly used to cosmetically freshen the skin, to cleanse an irritated area, and for personal hygiene. Witch hazel has long been an adjunct to perineal care following rectal or vaginal surgery or …