“… 1 The prevalence of acute intestinal vascular insufficiency, including IC, is 406 of 100,000. 2 Various medications can cause IC through vasoconstriction, hypotension, thrombogenic/procoagulant effect, or direct colonic toxicity. 1 , 3 , 4 Over-the-counter (OTC) systemic nasal decongestants include the alpha-adrenergic agonists pseudoephedrine and oral phenylephrine, which are used for symptomatic relief of nasal congestion in common cold, allergic rhinitis, and sinusitis.…”