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Page 2 of 4 What are the commonest causes of constipation? A large number of drugs or medicines that you may have been prescribed or have bought over-the-counter can cause constipation (see box). If your symptoms began (or got worse) after starting one of these drugs, it may be worth asking your doctor if there are any less-constipating alternatives.
Drugs that can cause constipation • Pain-killers (especially codeine-containing compounds) • Antacids (especially if containing aluminium) • Iron tablets • Blood pressure medications (not all) • Antidepressants (not all) • Anti-epilepsy and anti-Parkinson’s disease drugs
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