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Cardiology / Anticoagulation

❤️ Direct Oral Anticoagulants (DOACs)

A PharmD-curated clinical reference for the four FDA-approved DOACs: apixaban, rivaroxaban, dabigatran, and edoxaban. Covers approved indications, dosing, renal/hepatic adjustment, reversal, and key monitoring parameters.

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Approved Indications

DrugDVT/PE TxDVT/PE PpxAF (stroke prevention)ACS
Apixaban (Eliquis)
Rivaroxaban (Xarelto)
Dabigatran (Pradaxa)
Edoxaban (Savaysa)

Key Dosing

DrugAF (stroke ppx)Acute VTE treatmentVTE secondary ppx
Apixaban5 mg BID (2.5 mg BID if ≥2 of: age ≥80, weight ≤60 kg, SCr ≥1.5)10 mg BID × 7 days, then 5 mg BID2.5 mg BID
Rivaroxaban20 mg QD with evening meal15 mg BID × 21 days, then 20 mg QD with meal10 mg QD
Dabigatran150 mg BID (75 mg BID if CrCl 15–30)After ≥5 days parenteral: 150 mg BID150 mg BID
Edoxaban60 mg QD (30 mg QD if CrCl 15–50, weight ≤60 kg, or P-gp inhibitor)After ≥5 days parenteral: 60 mg QD60 mg QD

Renal Dosing Adjustments

DrugCrCl >50CrCl 30–50CrCl 15–30CrCl <15 / HD
Apixaban (AF)StandardStandard (use SCr-based dose reduction criteria)Not studied; use cautionFDA-labeled: 5 mg BID (2.5 mg BID if age ≥80 or ≤60 kg), see note
Rivaroxaban (AF)StandardStandard15 mg QD with mealAvoid
Dabigatran (AF)StandardStandard75 mg BIDAvoid (contraindicated <15)
Edoxaban (AF)Standard30 mg QD30 mg QDAvoid

⚠ Edoxaban showed reduced efficacy in AF patients with CrCl >95 mL/min (a trend toward higher stroke/systemic embolism vs. warfarin in the ENGAGE AF-TIMI 48 trial, attributed to lower drug exposure at high clearance). This is an FDA boxed warning: do not use edoxaban for stroke prevention in AF when CrCl >95 mL/min.

💡 Apixaban is the only DOAC with FDA labeling for ESRD/hemodialysis (5 mg BID, or 2.5 mg BID if age ≥80 or weight ≤60 kg). This dosing is based on pharmacokinetic data rather than outcomes trials; the RENAL-AF RCT was stopped early and did not demonstrate benefit, so use reflects clinical judgment. Apixaban remains the preferred DOAC across the CrCl 15–30 range.

Reversal Agents

AgentReversesDoseNotes
4-factor PCC (Kcentra)Apixaban, Rivaroxaban (off-label); also warfarin25–50 units/kg IV (often ~50 units/kg for life-threatening factor Xa inhibitor bleeding; institutional protocols vary)Now the practical default for factor Xa inhibitor–associated major bleeding following the withdrawal of andexanet alfa (see below). Off-label for DOACs but widely used and guideline-supported.
Idarucizumab (Praxbind)Dabigatran5 g IV (two 2.5 g vials given consecutively)Specific reversal agent for dabigatran. Rapid, complete reversal. Rebound possible if dabigatran redistributes from tissue.

Andexanet alfa (Andexxa) was voluntarily withdrawn from the US market effective December 22, 2025. The ANNEXA-I trial showed a net increase in thromboembolic events (including MI) versus usual care in intracranial hemorrhage, and the FDA determined its risks outweigh its benefits. 4-factor PCC is now the practical option for factor Xa inhibitor reversal.

PharmD Clinical Pearls

💡 Apixaban has the most favorable renal profile and the best evidence in patients with CKD, preferred DOAC in CrCl 15–30 range when anticoagulation is necessary.
💡 Rivaroxaban and edoxaban must be taken with food for adequate absorption at the higher doses. Counsel patients explicitly. This is a common adherence failure point.
💡 Dabigatran is the only DOAC monitored by a direct lab test (thrombin time, diluted TT, or ecarin clotting time). Standard PT/INR is not useful for DOACs.
💡 All DOACs interact significantly with strong P-gp and/or CYP3A4 inhibitors/inducers. Screen for rifampin (major inducer, reduces levels dramatically), azole antifungals, and carbamazepine.
💡 In patients with mechanical heart valves or moderate-severe mitral stenosis: DOACs are contraindicated. Warfarin only.
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Reviewed by a licensed pharmacist
Reference content reviewed for clinical accuracy. This is not a substitute for institutional protocols or professional judgment.

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