Verapamil ER HCL Formulation
Yes, verapamil extended-release (ER) hydrochloride is formulated as a 24-hour controlled-release preparation designed for once-daily dosing.
Formulation Details
The extended-release formulation of verapamil HCL is specifically engineered to provide sustained drug delivery over a 24-hour period. According to FDA labeling, verapamil hydrochloride extended-release tablets should be administered once daily, with dosing typically ranging from 120 mg to 480 mg depending on the indication 1.
Key Pharmacokinetic Properties
The extended-release formulation differs significantly from immediate-release verapamil in its absorption profile:
- Peak plasma concentrations occur at approximately 7.71 hours when taken with food (compared to 5.21 hours when fasting) 1
- Bioavailability is similar to immediate-release formulations when measured by AUC, but the rate of absorption is deliberately slowed 1
- Food administration produces a narrower peak-to-trough ratio, which is clinically advantageous for maintaining stable drug levels 1
Specialized COER-24 System
Some verapamil ER formulations utilize a Controlled-Onset Extended-Release (COER-24) delivery system, which is designed with a 4-5 hour delay in drug release after administration 2. This chronotherapeutic approach is specifically engineered for bedtime dosing to achieve:
- Maximal blood pressure reduction during early morning hours (6 AM to noon) when cardiovascular risk is highest 3
- Sustained 24-hour blood pressure control with reductions of -11.6/-9.0 mm Hg during the critical morning period 3
- Better alignment with circadian blood pressure patterns 4, 5
Clinical Dosing
For hypertension, the FDA-approved dosing is 1:
- Initial: 180 mg once daily in the morning (or 120 mg for elderly/small patients)
- Titration: Can increase to 240 mg daily, then 180 mg twice daily, or up to 240 mg every 12 hours based on response
- Maximum: 480 mg daily
Important caveat: When switching from immediate-release to extended-release verapamil, the total daily dose in milligrams typically remains the same, but the dosing frequency changes to once or twice daily 1.
The 24-hour formulation should be taken with food to optimize the pharmacokinetic profile and minimize peak-to-trough variability 1.