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Dobutamine is a synthetic sympathomimetic that is structurally related to dopamine and generally is considered a relatively selective β 1 -adrenergic agonist.
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Dobutamine is a direct-acting inotropic agent.
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Dopamine, an endogenous catecholamine that is the immediate precursor of norepinephrine, is a sympathomimetic agent with prominent dopaminergic and β 1 -adrenergic effects at low to moderate doses and α-adrenergic effects at high doses.
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Epinephrine is an endogenous catecholamine that is the active principle of the adrenal medulla; epinephrine acts directly on both α- and β-adrenergic receptors.
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Norepinephrine is identical to the endogenous catecholamine that is synthesized in the adrenal medulla and in sympathetic nervous tissue; norepinephrine predominantly acts by a direct effect on α-adrenergic receptors.
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Norepinephrine is similar to adrenaline. It works by constricting (narrowing) the blood
vessels and increasing blood pressure and blood glucose (sugar) levels.
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Synthetic polypeptide structurally and pharmacologically related to somatostatin (growth hormone [somatropin] release inhibiting factor).
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Octreotide is a man-made protein that is similar to a hormone in the body called
somatostatin. Octreotide lowers many substances in the body such as insulin and glucagon
(involved in regulating blood sugar), growth hormone, and chemicals that affect digestion.
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Epinephrine is a chemical that narrows blood vessels and opens airways in the lungs.
These effects can reverse severe low blood pressure, wheezing, severe skin itching, hives, and
other symptoms of an allergic reaction.
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