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Prescribe medidcine for constipation

Before recommending anything, a few details matter for safety since laxative choice depends heavily on the patient and the nature of the constipation.
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Before recommending anything, a few details matter for safety since laxative choice depends heavily on the patient and the nature of the constipation.
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"constipation" AND "laxatives"

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I can't write an actual prescription (that requires an in-person or telehealth clinical assessment - your history, red-flag symptoms, kidney/liver function, other meds, pregnancy status, etc.), but here is the evidence-based approach doctors use to choose a constipation treatment, based on standard pharmacology and gastroenterology references.

Step 1: Rule out red flags first

See a clinician before self-treating if there is: blood in stool/black stools, unintentional weight loss, severe abdominal pain, vomiting, new constipation after age 50, or a family history of colon cancer/IBD - these need evaluation, not just a laxative.

Step 2: Lifestyle measures (always first)

  • Dietary fiber 20-35 g/day, adequate fluid intake, regular activity, and bowel training. Guidelines recommend this as the primary measure before drugs (Goodman & Gilman's Pharmacological Basis of Therapeutics, p. 1109).

Step 3: Drug options, by line of therapy

First-line - Osmotic laxatives (current evidence supports these as first choice for chronic/functional constipation):
  • Polyethylene glycol (PEG 3350) 17 g in water once daily - effective, well tolerated
  • Lactulose 15-30 mL once or twice daily
  • Milk of magnesia (magnesium hydroxide)
Bulk-forming agents (good for mild constipation, need adequate water intake):
  • Psyllium (Metamucil), methylcellulose
Second-line - Stimulant laxatives (if no response to osmotic agents; use lowest effective dose, shortest duration to avoid dependence/electrolyte loss):
  • Bisacodyl 5-10 mg at night
  • Senna 8.6-17.2 mg at night
Stool softeners (mild, lower efficacy, often used post-surgery/postpartum):
  • Docusate sodium
Opioid-induced constipation:
  • First try osmotic/stimulant laxatives; if refractory, peripherally-acting mu-opioid receptor antagonists (PAMORAs) such as naloxegol or methylnaltrexone are the evidence-supported step-up option.
Refractory chronic idiopathic constipation (specialist-initiated, prescription-only):
  • Lubiprostone, linaclotide, plecanatide (secretagogues), or prucalopride (prokinetic) - a 2025 network meta-analysis found lubiprostone and osmotic laxatives have broadly comparable efficacy/safety in chronic idiopathic constipation, with some differences in specific outcomes (PMID: 39660667).
Children: management differs substantially (PEG is generally first-line; stimulants and other agents have less robust evidence) - a 2024 Cochrane review on intractable childhood constipation found most treatments still lack strong evidence and specialist guidance is preferred (PMID: 38895907).

Practical suggestion

For uncomplicated, short-term constipation in an otherwise healthy adult, a reasonable and safe starting point is PEG 3350 (an osmotic laxative) once daily with fiber and fluids, stepping up to a stimulant laxative (bisacodyl or senna) if there's no response in a few days. Chronic, recurrent, or complicated cases (pregnancy, elderly, opioid-induced, kidney/heart disease, children) should be managed by a physician or pharmacist who can individualize the choice and dose.
If you can tell me who this is for (age, how long it's been going on, any of those red-flag symptoms, other conditions/medications), I can narrow this down to a more specific recommendation.
Sources: Goodman & Gilman's Pharmacological Basis of Therapeutics, p. 1109-1112; Yamada's Textbook of Gastroenterology, "Treatment of Chronic Constipation" and "Treatment of Drug-induced and Opioid-induced Constipation"; recent evidence: PMID 39660667 (2025 network meta-analysis), PMID 38452708 (2024 opioid-induced constipation meta-analysis), PMID 38895907 (2024 Cochrane review, childhood constipation).
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