11
Table 4. Common Drugs Causing Constipation
Analgesics (opioids, tramadol)
Anticholinergic agents
Anticonvulsants (phenytoin)
Antidepressants (serotonin 5-HT
3
antagonists, tricyclics)
Antihistamines
Antihypertensive drugs
(particularly calcium channel antagonists, diuretics, methyldopa)
Antiparkinsonian drugs (dopaminergic agents)
Antipsychotics (phenothiazine derivatives)
Bile acid resins (cholestyramine)
Calcium channel blockers
Calcium supplements
Diuretics (furosemide, hydrochlorothiazide)
Metal ions such as antacids (aluminum or calcium), iron supplements
Source: Rao SS. Constipation — method of investigation. In: Rakel RE (ed). Conn's Current
erapy. Philadelphia: WB Saunders, 1999:20.
