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Enemas: Most enema preparations contain
large amounts of water in addition to something that is
not efficiently absorbed by the intestinal lining. This
prevents the water in the enema from being absorbed, so
the water remains in the colon. The enema is inserted into
the rectum. This softens the stool in the rectum and creates
pressure within the rectum. This pressure gives the child
a powerful urge to pass a bowel movement, and the stool
is usually expelled rapidly. Common examples include phosphate
or saline (salt) solutions or milk and molasses. The effectiveness
of any particular enema preparation is probably more dependent
on the volume (size) of the enema than on its chemical
makeup.
The phosphate-sodium enema (Fleet Enema) is probably the
most widely used type.
Note: Some gastrointestinal specialists
discourage the use of enemas and suppositories or any
anal
intervention because the child associates fear and pain
with the anal area. The child may struggle or feel additional
trauma when these types of manipulations are performed.
Eventually, all impacted stool can be dissolved or disimpacted
by using medications taken by mouth.
Osmotic laxatives: These laxatives
contain agents that are not efficiently absorbed by the
intestinal lining. This results in large amounts
of extra water in the intestine, which softens the stool.
Since all osmotic laxatives work by increasing the amount
of water in the colon, it is important that your child
drinks lots of fluid while taking any of these laxatives.
Like
any medication, these should be given only as recommended
by your child's health care provider. If the laxative
does not seem to be working, do not increase the dose
without
talking to your child's health care provider. Rarely,
these products interfere with other medications that your
child takes.
Magnesium hydroxide (FreeLax,
Philip's Milk of Magnesia, Haley's MO) -
Besides causing retention of fluid in the intestine,
this
laxative promotes the release of a hormone that stimulates
movement of stool through the intestine. Some children
experience abdominal cramping. This laxative is flavorless
but has a thick chalky texture that may be more acceptable
when mixed with a fluid such as milk or chocolate milk.
It should be avoided by children with kidney problems.
Lactulose (Chronulac, Constilac,
Duphalac, Kristalose, Lactulose) - This laxative is
generally very well tolerated and tastes sweet. It may
cause gas and abdominal cramping at usual doses.
Polyethylene glycol powder (Miralax)
- This may pose less risk of dehydration or electrolyte
imbalance than other osmotic laxatives. The powder
is mixed in 8 ounces of water, juice, soda, coffee,
or tea. The usual dose is 17 g (fill to measuring line
in cap of bottle) of powder per day. This laxative
is tasteless, odorless, and usually quite easy to take.
It may take slightly longer to work than other products.
Sorbitol - This is generally
well tolerated and tastes quite sweet. It often causes
gas
and abdominal cramping
Magnesium citrate (Evac-Q-mag)
- This works by the same mechanism as magnesium hydroxide.
The product is clear (not chalky like magnesium hydroxide)
and may be chilled to improve palatability.
Polyethylene glycol balanced
electrolyte solutions (COLYTE, GoLYTELY) - These
balanced electrolyte solutions are often used as purgatives
in preparation
for colonoscopy or abdominal surgery. They require drinking
a large volume of fluid, which may be more acceptable
if chilled. This laxative may be associated with nausea,
bloating, abdominal cramps, and vomiting.
Emollient laxatives: These products
decrease the absorption of water from the colon, and thus
soften the stool, making it easier to pass.
Mineral oil (Mineral Oil, Milkinol)
- This laxative is largely tasteless and has an oily
consistency. It may be more palatable if cold or mixed
into a fluid
such as orange juice. It may cause seepage of orange
oil from anus, which can cause itching and stain the
underwear.
This laxative should generally not be given with food.
Stimulant laxatives: These agents
have direct actions on the lining of the intestinal wall.
They
increase water and salt secretion into the colon and irritate
the intestinal lining to produce contractions.
Sennosides (Aloe Vera, Ex-Lax,
Fletcher's Castoria, Senokot) - This laxative
is derived from a plant, stimulates salt and water secretion
into the colon, and promotes movement of stool through
colon. It may cause abdominal cramping at higher doses.
Bisacodyl (Dulcolax) - This
colorless and odorless compound increases colonic peristalsis
and stimulates salt and water secretion. It can be given
by mouth or as a suppository and may cause abdominal cramping
at higher doses.
Dioctyl sodium sulphosuccinate
(Colace) - This is a detergent that simulates salt
and water secretion into the colon and promotes movement
of stool through the colon. It may cause abdominal cramping
at higher doses.
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