TOXYLACT: A02a introduction

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Antacids in ATC group A02A are locally acting agents that neutralise gastric acid and relieve dyspeptic symptoms, with a generally favourable toxicological profile and broad safety in pregnancy and lactation when used at recommended doses.

Summarized page content (A02A – Antacids)

Antacids in ATC category A02A comprise plain antacid preparations and fixed‑dose combinations with antiflatulents or other agents that act primarily in the gastric lumen. They include aluminium, magnesium and calcium compounds, as well as certain complexes and mixtures, which rapidly neutralise hydrochloric acid and can inactivate pepsin, thereby providing short‑term relief of heartburn, acid regurgitation and epigastric discomfort.

From a toxicological perspective, antacids are considered safe when taken as directed, but chronic or excessive use may lead to clinically relevant electrolyte and acid–base disturbances, particularly in patients with renal impairment. Aluminium-containing products are associated mainly with constipation and, at high or prolonged exposure, with risk of aluminium accumulation, whereas magnesium salts may cause diarrhoea and, rarely, hypermagnesaemia with neuromuscular or cardiovascular toxicity. High doses of calcium carbonate can precipitate milk‑alkali–like syndromes with hypercalcaemia and renal dysfunction, especially in susceptible individuals or when combined with other calcium sources.

In pregnancy, short‑term use of aluminium, magnesium and calcium-based antacids at recommended doses is generally regarded as safe, and is integrated in stepwise management of gastro‑oesophageal reflux and heartburn when lifestyle measures are insufficient. Preparations containing sodium bicarbonate are discouraged in pregnancy because of the risk of systemic alkalosis and excess sodium and fluid load for both mother and fetus. Available data indicate that occasional use of these antacids during pregnancy is not associated with teratogenicity or increased risk of major congenital malformations.

During lactation, systemically absorbed amounts of aluminium, magnesium and calcium from standard antacid doses are low, and transfer into breast milk is minimal and not expected to cause adverse effects in the nursing infant at therapeutic exposure levels. Most guidelines therefore consider usual-dose antacids compatible with breastfeeding, while recommending avoidance of chronic high-dose regimens and careful consideration of maternal comorbidities such as kidney disease. Overall, A02A antacids represent a long‑established treatment option with a well‑characterised safety profile in both the general population and in special physiological states such as pregnancy and lactation when they are used appropriately.

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