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The 30 pages that link to First-pass effect, each with the reason it gives.

• PharmacokineticsRelated: It can reduce the fraction of an oral dose reaching systemic circulation.

• BioavailabilityRelated: It can remove a substantial fraction of an orally absorbed dose before that dose enters circulation.

• Drug metabolismRelated: Presystemic metabolism can sharply reduce the fraction of an oral dose reaching circulation.

• Drug deliveryRelated: It can reduce the amount of an oral dose reaching the bloodstream.

• Oral administrationRelated: It can substantially reduce the active amount reaching the bloodstream after swallowing.

• ProdrugRelated: Some prodrugs exploit metabolism in the gut or liver for activation.

• CYP3A4Related: Intestinal and liver CYP3A4 can remove a substantial fraction of some oral doses.

• AlbendazoleRelated: Extensive first-pass metabolism converts albendazole into its active sulfoxide metabolite.

• LidocaineRelated: Extensive first-pass metabolism helps explain why lidocaine is not generally used orally for systemic effects.

• Biological half-lifeRelated: It changes how much substance enters circulation, but is not itself a measure of elimination half-life.

• PropranololRelated: Extensive first-pass metabolism helps explain propranolol’s variable oral bioavailability.

• Dosage formRelated: Oral dosage forms can expose drugs to this loss before systemic absorption.

• Intranasal corticosteroidRelated: Swallowed portions of some nasal doses undergo this metabolism, limiting systemic exposure.

• Active metaboliteRelated: First-pass metabolism can create active compounds before a drug reaches systemic circulation.

• Drug absorptionRelated: It reduces the unchanged drug reaching systemic circulation after some administration routes.

• Blood alcohol concentrationRelated: It can remove some ethanol before absorption contributes to circulating BAC.

• DextromethorphanRelated: Liver metabolism strongly shapes how much dextromethorphan reaches the bloodstream unchanged.

• MidazolamRelated: Extensive first-pass metabolism limits oral midazolam bioavailability.

• Chloral hydrateRelated: Rapid conversion after absorption helps explain chloral hydrate’s short-lived parent-compound presence.

• Route of administrationRelated: Oral drugs may lose a substantial fraction of their dose before reaching circulation.

• ClonidineRelated: This process helps explain differences between oral and transdermal clonidine exposure.

• NifedipineRelated: Extensive first-pass metabolism contributes to nifedipine’s formulation-dependent exposure.

• TramadolRelated: Oral tramadol undergoes metabolism that contributes to formation of its active metabolite.

• DiltiazemRelated: Extensive first-pass metabolism contributes to diltiazem's formulation-dependent dosing.

• MetoprololRelated: Extensive first-pass metabolism contributes to variation in metoprolol exposure between people.

• BisoprololRelated: Bisoprolol has relatively high oral bioavailability, in part because first-pass metabolism is limited.

• SulfasalazineRelated: After cleavage, absorbed sulfapyridine undergoes substantial metabolism, influencing exposure and tolerability.

• HydromorphoneRelated: It affects oral hydromorphone exposure and helps distinguish routes of administration.