Nursing care
Rectal suppository insertion: Sims position, placement against the wall and vagal response
Written and reviewed by William Harris, BSN, RN, CNOR · 4 min read · Updated October 2026
Short answer
To insert a rectal suppository, place the client in the left Sims position, lubricate the rounded tip and a gloved finger with water-soluble lubricant, and insert it rounded end first past the internal sphincter along the rectal wall, not into stool. Ask the client to stay on their side afterward and watch for dizziness or slowed heart rate from vagal stimulation.
Why the rectal route is used and when it is avoided
Rectal medications act locally, as with laxatives, or systemically, as with some analgesics when the oral route cannot be used. Absorption through the rectal mucosa bypasses the upper gastrointestinal tract, and the route can reduce stomach irritation, nausea and vomiting from some drugs. Suppositories are cone-shaped and melt at body temperature to release the drug.
The route is contraindicated after rectal or bowel surgery, with rectal bleeding or prolapse, and with low platelet counts, because insertion can injure fragile tissue. Many oncology policies also avoid rectal medications in neutropenia because of infection risk. Clients with certain cardiac conditions or arrhythmias may be unsuitable because of the vagal response, so check the order and history first.
Positioning and preparation
Complete the usual medication checks and identify the client with two identifiers. If possible, have the client empty their bowel first. Raise the bed to working height, provide privacy, and position the client on the left side with the upper leg flexed toward the waist, the Sims position, which follows the natural curve of the rectum and colon.
Drape so only the buttocks are exposed and place a pad underneath. Put on clean gloves and assess for diarrhoea or active rectal bleeding before going further. Unwrap the suppository and apply water-soluble lubricant to its rounded tip and to the gloved index finger of the dominant hand. A client who prefers to self-administer can be taught the same steps.
Critical insertion steps where errors happen
Separate the buttocks with the nondominant hand. Ask the client to take a deep breath and exhale through the mouth, which relaxes the anal sphincter. Insert the suppository rounded end first, directed toward the umbilicus, past the internal sphincter and against the rectal wall, about three to four inches in an adult according to the Open RN skills text.
The most common errors are pushing the suppository into a mass of stool, where it cannot be absorbed, stopping short of the sphincter so it is expelled, and inserting without enough lubrication. After placement, ask the client to remain on their side for several minutes so the suppository is retained, and keep the call light within reach.
Vagal response and other complications
Rectal stimulation can trigger a vasovagal response: heart rate and blood pressure drop, and the client may become dizzy, pale or sweaty, and occasionally faint. If this happens, stop, remove your hand, keep the client lying flat, assess pulse and blood pressure, stay with them and notify the provider per policy.
Consider this hypothetical scenario. During insertion a client says they feel faint and their pulse has slowed. Options include finishing quickly so the dose is not wasted, sitting the client upright, or stopping, keeping the client flat and checking vital signs. Stopping and assessing is correct, because the symptoms suggest vagal stimulation and sitting up worsens low blood pressure.
Safety, evaluation and documentation
Remove gloves inside out, dispose of supplies, and perform hand hygiene. Leave the bed low and locked, the call light and table within reach and the room clear of trip hazards. Clients given a laxative suppository may need help reaching the toilet or a commode, so plan for that before leaving.
Document the medication, route, time, the client's tolerance and any findings such as bleeding or a vagal episode. Evaluate the effect within the expected time frame for that drug, for example a bowel movement or pain relief, and report an unexpected response or no effect according to agency policy.
Sources and further reading
Open RN Nursing Skills: Checklist for Rectal Medication Administration. Sims position, water-soluble lubricant, deep breath and exhale, insertion toward the umbilicus against the rectal mucosa, avoiding feces, vagal stimulation, staying on side afterward, safety checks and documentation.
Open RN Nursing Skills: Basic Concepts of Administering Medications. Local and systemic uses of rectal medications, contraindications after rectal or bowel surgery, rectal bleeding or prolapse and low platelets, and vasovagal response risk in cardiac arrhythmias.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our fundamentals practice questions are the closest set to what this page covers.
Common questions
Which side should a client lie on for a suppository?
The left side in the Sims position, with the upper leg flexed. This position follows the anatomy of the rectum and sigmoid colon and makes insertion and retention easier.
Why must a suppository not be placed into stool?
The drug is absorbed through the rectal mucosa. A suppository buried in stool has little contact with the wall, so the medication may not be absorbed or may be expelled.
What are signs of a vagal response during rectal medication?
Dizziness, sweating, pallor, a slowing heart rate and falling blood pressure, sometimes fainting. Stop the procedure, keep the client flat, assess vital signs and notify the provider per policy.
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