Nausea/vomiting outpatient workflow

Workflow for dehydration-risk assessment, supportive management, and escalation when oral-intake failure persists.

Medium-risk workflowLast reviewed September 4, 2026

AI-assisted evidence review. Clinical-owner sign-off is not recorded for this update.

Scope

Use for

Initial outpatient assessment of nausea/vomiting in clinically stable adults; pediatric and pregnancy-specific treatment require their own pathways.

Not for

Persistent hemodynamic instability or severe dehydration requiring urgent IV pathway.
GI bleeding or severe focal abdominal pathology requiring emergency care.

Check vital signs, mental status, urine output and ability to retain fluids; assess aspiration risk if consciousness is impaired.
Review pain, bleeding, bowel function, headache/neurologic symptoms, pregnancy possibility, diabetes, medicines and possible toxic exposure.
Check glucose promptly when diabetes or metabolic illness is possible; nausea/vomiting alone does not establish gastroenteritis.

Treat these as urgent. Escalate early if concern persists or follow-up is unreliable.

Arrange immediate ED assessment for shock, altered consciousness, GI bleeding, severe abdominal pain or suspected obstruction; use EMS when unstable or transport is unsafe.
Activate the relevant emergency pathway for chest symptoms, focal neurologic findings, severe headache with meningism, suspected poisoning or diabetic ketoacidosis.
Failed oral intake with progressive dehydration, significant metabolic disturbance or pregnancy-related severe illness requires urgent assessment rather than repeated symptomatic treatment.

If clinically appropriate, offer small, frequent amounts of oral rehydration solution and confirm tolerance before outpatient disposition.
Select investigations for the suspected cause and severity, including pregnancy testing, electrolytes and renal function when indicated.
Treat the cause and consider an antiemetic only after reviewing interactions, QT risk, sedation and pregnancy status. Repeated treatment failure should trigger diagnostic reassessment rather than automatic drug stacking.

Agree on a specific reassessment time and responsibility for test results; marginal oral tolerance requires earlier review.
Give clear fluid/urine-output monitoring advice appropriate to comorbidity; avoid a universal fluid-volume target.
Seek urgent care for inability to retain fluids, worsening weakness, blood, new severe pain or neurologic/chest symptoms; do not wait for follow-up if deterioration occurs.

Return precautions you can say as written:

“If symptoms get worse, new warning signs appear, or you cannot follow the plan from this visit, seek urgent care now.”

Point to the red flags above that apply to this patient.
Confirm follow-up timing and where to go after hours.
Attach a relevant handout to reinforce the plan.
Document disposition, rationale, unresolved uncertainty, and that precautions were understood.

Clinical owner: Family Medicine Editorial Team
Risk tier: Medium
Review cadence: Every 6 months
Last reviewed: September 4, 2026AI-assisted evidence review. Clinical-owner sign-off is not recorded for this update.
Review status: Evidence current. Next review due March 4, 2027.