C & D - Constipation

24 important questions on C & D - Constipation

Idiopathic constipation associated with chronic or recurrent abdominal discomfort that is relieved by defecation

Irritable bowel syndrome with constipation (IBS-C)

Constipation persists for several weeks or longer and the cause is unknown

Chronic idiopathic constipation (CIC)

Non-drug treatments for constipation

Increase fluid intake and physical activity
Limit caffeine and alcohol intake
Replace refined foods with foods high in fiber  
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If constipation is not improved after how many days, should a healthcare provider be consulted?

7 days

OTC recommendation for iron-induced or hard stool

Stool softener or fiber

OTC if fast relief needed in adults

Bisacodyl or glycerin (more gentle) suppository

OTC if fast relief needed in children

Glycerin suppository

1st line in most cases and treatment of choice in pregnancy

Bulk forming drugs (soluble fiber- psyllium) and dietary fiber

Contain large ions or molecules that are poorly absorbed to draw fluid into the bowel lumen through osmosis, which distends the colon and increases peristalsis. For CIC, can be monotherapy or given with fiber

Osmotics (PEG)

Directly stimulate neurons in the colon, causing peristaltic activity

Stimulants (senna, bisacodyl)

Emollients that reduce the surface tension of stool, allowing more water to mix with stool, which softens fecal mass and makes defecation easier. Often used by patients taking iron

Stool softeners (docusate)

Coat the bowel and stool with waterproof film to keep moisture in the stool and make defecation easier

Lubricants (mineral oil)

What are the bulk-forming drugs?

Psyllium (Metamucil)
Calcium polycarbophil (FiberCon)
Methylcellulose (Citrucel)
Wheat dextrin (Benefiber)

What are the osmotic drugs?

Magnesium hydroxide (Milk of Magnesia)
Polyethylene glycol (Miralax)
Glycerin
Lactulose
Sodium phosphates (Fleet Enema)

What is the one Rx osmotic drug?

Lactulose

What condition is lactulose commonly used for?

Hepatic encephalopathy

What are the stimulant + stool softeners?

Senna + Docusate (Senna S, Senokot S)

What are the emollients (Stool softeners)?

Docusate sodium (Colace)

When are emollients (stool softeners) preferred?

When stool is hard or dry and when straining should be avoided

For hospitalized surgery patients to decrease risk of post-op ileus with a max of 15 doses

Peripherally acting mu opioid receptor antagonists (PAMORAs)- Alvimopan (Entereg)
CI in opioids for >7 consecutive days right before use 

Which PAMORAs are used only in patients taking opioids who have OIC?

Methylnaltrexone (Relistor)
Naloxegol (Movantik)

What is the 5-HT4 rec agonist used for CIC with a warning for suicidal ideation?

Prucalopride (Motegrity)
Diarrhea

BBW for sodium phosphates (OsmoPrep)

Nephropathy, gastric bypass or stapling surgery

What are the laxatives used for whole bowel irrigation?

Polyethylene glycol electrolyte solution (Colyte, GoLytely)
Sodium phosphates (OsmoPrep)
Sodium sulfate, potassium sulfate and magnesium sulfate (Suprep Bowel Prep Kit)

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