NR_565_Final_Exam_Study_Guide

Antacids: weak bases that react with hydrochloric acid to form salt & water. o Used in the treatment of Hyperacidity, GERD, PUD, hyperphosphatemia, and calcium deficiency o Contain combinations of ▪ metallic cation (aluminum, calcium, magnesium, and sodium) ▪ and basic anion (hydroxide, bicarbonate, carbonate, citrate, and trisilicate) Pharmacodynamics, Pharmacokinetics, Pharmacotherapeutics o Neutralize Gastric Acidity (causes ^pH of the stomach and duodenal bulb) o Inhibit proteolytic activity of pepsin o Increase lower esophageal sphincter tone o Acid-neutralizing capacity ANC varies between products expressed in mEqs o If ingested in a fasting state, antacids reduce acidity for approximately 20 to 40 minutes o If taken 1 hr after a meal, acidity is reduced for 2 to 3 hrs o A second dose taken after a meal maintains reduced acidity for more than 4 hrs after the meal o The action of antacids occurs locally in the GI tract with minimal absorption, minimal metabolism o ALL antacids are contraindicated in the presence of severe abdominal pain of unknown cause, especially if accompanied by fever -HIGH SODIUM content: pts w/ HTN, CHF, marked renal failure, or on low-sodium diets need to use low sodium preparation -Concurrent administration with enteric-coated drugs, destroys the coating= alters absorption, ^ the risk for adverse effects -Administrations should be separated by at least 2 hours to decrease drug/drug interactions 1. Calcium based antacids: TUMS, Caltrate, Calcarb • Prescribed to treat calcium deficient states, i.e. chronic renal failure, post-menopause, and osteoporosis • Used to bind phosphates in CRF • Require Vitamin D for absorption from the GI tract • Excreted mainly in feces, 20% in urine • ADR: Contraindicated in the presence of hypercalcemia and renal calculi • Can cause constipation- increase bulk, fluids and mobility, stool softener • Administered 30min- 1hr on empty stomach or 3hr after meals • Should not be administered with food containing large amounts of oxalic acid (spinach, rhubarb), or phytic acid (bran, cereals), they decrease the absorption of calcium • Taking w/ foods containing phosphorus (milk, dairy) can lead to milk-alkali syndrome (N/V, confusion, headache). • Taking with acidic fruit juice improve absorption 2. Aluminum based: AlternaGEL, Amphojel, Mylanta • Inhibit smooth muscle contraction and slow gastric emptying • Used to bind phosphates in CRF Aluminum is not easily removed by dialysis b/c it is bound to albumin & transferrin = do not cross dialysis membrane • Not absorbable with routine use • Aluminum concentrated in the CNS • Bind with phosphate and excreted in feces • Prolonged use in patients with renal failure may result in dialysis osteomalacia o Aluminum deposits in bone and osteomalacia occurs • Elevated aluminum tissue levels contribute to the development of dialysis encephalopathy • Used to treat hyperphosphatemia in pts w/ renal failure & phosphate renal stone prevention • Can cause constipation- increase bulk, fluids and mobility, stool softener ..............................CONTINUED...................