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GLP-1s slow gastric emptying, and a standard pre-operative fast may not empty the stomach

Written by Transparent Peptide research desk·Published 2026-08-01·Last reviewed 2026-08-01·Methodology·News
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Anaesthesia guidance exists because case reports described residual gastric contents after adequate fasting. It applies to compounded products too.

Pre-operative fasting rules assume a normal rate of gastric emptying. A GLP-1 deliberately slows it, which is part of how it works — and which breaks the assumption the rules are built on.

The specific failure mode with compounded products: a patient on a branded pen usually names it. A patient on a telehealth compounded preparation frequently says "a weight-loss shot" or nothing at all. It is the same molecule with the same effect.

One sentence covers it: "I take [drug] at [dose], [weekly or daily], last dose [date]." It applies to any procedure involving sedation. Detail: GLP-1s and surgery.

Filed by the Transparent Peptide research desk. Corrections: the corrections log.