Q: What is the dose of erythromycin in hospitalized patients to treat gastroparesis? 

Answer: Erythromycin lactobionate is effective when given IV at a dose of 3 mg/kg every 8 h (by IV infusion over 45 min to avoid sclerosing veins), as was shown in hospitalized diabetics with gastroparesis.

Reference: 

Guidelines for Management of Gastroparesis - American College of Gastroenterology - Am J Gastroenterol 2013; 108:18–37