Cardiology · USMLE Step 1 and Step 2

Direct Renin Inhibitors song

Aliskiren - Mechanism & Side Effects, as a song. Hear the short teaser here. The full song is on YouTube and Spotify.

Direct Renin Inhibitors

Full song on YouTube ↗Spotify ↗

Key points in this song10

Aliskiren is the only FDA-approved direct renin inhibitor, binding the active site of renin to block conversion of angiotensinogen to angiotensin I.
By inhibiting renin directly, aliskiren reduces plasma renin activity (PRA) while causing a compensatory rise in plasma renin concentration (PRC) due to loss of negative feedback.
Aliskiren is indicated for hypertension but is contraindicated in combination with ACE inhibitors or ARBs in patients with diabetes or CKD (GFR <60) due to increased risk of hyperkalemia, hypotension, and renal impairment.
Aliskiren is absolutely contraindicated in pregnancy (Category X/teratogenic) due to fetal renal dysgenesis, hypotension, and death — same black-box warning shared with ACE inhibitors and ARBs.
Unlike ACE inhibitors, aliskiren does not cause bradykinin accumulation and therefore does not cause a dry cough or angioedema via that mechanism.
The primary adverse effects of aliskiren include hyperkalemia, hypotension (especially in volume-depleted patients), and diarrhea (most common GI side effect).
Aliskiren has poor oral bioavailability (~2.5%) and a long half-life (~40 hours), allowing once-daily dosing.
High-fat meals significantly reduce aliskiren absorption; patients should take it consistently with or without food.
Aliskiren is a substrate and inhibitor of P-glycoprotein; concurrent use with cyclosporine or itraconazole is contraindicated due to markedly increased aliskiren levels.
In heart failure and post-MI patients already on ACE inhibitors or ARBs, adding aliskiren showed no benefit and increased harm (ALTITUDE trial), reinforcing its contraindication in dual RAAS blockade.