Below will be links for the full Podcast and the Drug Card for valsartan along with a brief summary of various points on valsartan.Â
QUESTIONS:
- When initiating treatment for hypertension what is a correct dosing regimen? Select all that apply.Â
- A). 20 mg po qd.
- B). 20 mg po bid.
- C). 40 mg po qd.
- D). 80 mg po qd.Â
- E). 160 mg po qd.Â
- Describe the mechanism of action and pharmacology of valsartan.
- What is the duration of action for Diovan?
- True or False. Valsartan can be used in pediatrics when treating valsartan.Â
- True or False. Valsartan solution or suspension is more bioavailable than tablets.
SUMMARY:
Valsartan, also known as Diovan, is an angiotensin II receptor blocker (ARB). It is used for treating NYHA class II to IV heart failure along with both treating and managing hypertension. Another common indication is for both STEMI and NSTEMI patients. Typical initiation dosing for heart failure, STEMI and NSTEMI is 20 mg twice daily with titrations up to 160 mg twice daily. When initiating treatment for hypertension the range begins at 80-160 mg po every day up to a max dose of 320 mg per day. Valsartan works by blocking AT2 from the AT1 receptor and is considered to be more efficient than ACEs along with having less side effects such a cough. Some common side effects are orthostatic hypotension, dizziness, and lightheadedness. Common monitoring parameters for valsartan are blood pressure, blood pressure urea, pregnancy, and electrolytes. Patients should avoid salt substitutes containing potassium. There is a black box warning for fetal toxicity because drugs that affect the renin-angiotensin system can cause injury/death to the fetus.
ANSWERS:Â Â
- Both D and E are correct. Dosing for hypertension initiation is 80-160 mg qd up to max of 320 mg qd.Â
- Valsartan is an angiotensin II (AT2) receptor antagonist (blocker) that displaces AT2 from the AT1 receptor. It acts directly on the pathway causing vasoconstriction along with water intake; as well as causing the release of aldosterone, catecholamines, and arginine vasopressin. (It is purposed that ARBs are more efficient than ACEs and have less side effects.)Â
- 24 hours.
- True. Although the data is limited, there are weight based dosing regimens available.
- True. The time to peak in adults for the tablet is around 2-4 hours while the solution is around 0.7-3.7 hours.
PDF of Drug Card: valsartan