Maximum Dosing Frequency for Felodipine 5mg
Felodipine 5mg should be administered once daily (QD). This is the standard and recommended dosing frequency across all major guidelines and the FDA label.
Guideline Recommendations
The 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APHA/ASH/ASPC/NMA/PCNA Guideline consistently specifies that felodipine 2.5-10 mg is dosed once daily 1, 2, 3. This recommendation appears uniformly across multiple publications of this guideline, establishing once-daily dosing as the standard of care for felodipine extended-release formulations.
The 2003 JNC 7 guideline similarly lists felodipine with a dose range of 2.5-20 mg given once daily 4.
FDA Label Confirmation
The FDA drug label explicitly states that felodipine is administered at "2.5 mg to 10 mg once a day" as the recommended dosage range 5. The label emphasizes that this applies to the extended-release formulation, which is designed for once-daily administration.
Clinical Evidence Supporting Once-Daily Dosing
Multiple clinical trials confirm the efficacy of once-daily dosing:
A comparative study demonstrated that felodipine extended-release 10 mg once daily was equivalent to plain tablets 5 mg twice daily in treating hypertension, with 71% of patients responding to the once-daily regimen 6
Research in elderly hypertensive patients showed that felodipine 5 mg once daily maintained more than 75% of its peak effect at 24 hours, confirming adequate duration of action for once-daily dosing 7
The FEVER trial successfully used felodipine once daily in 9,800 Chinese hypertensive patients, demonstrating sustained blood pressure control over an average 40-month follow-up 8
Important Caveats
Do not use twice-daily dosing for the extended-release formulation. While older immediate-release formulations of felodipine were dosed 2-3 times daily 9, 10, 11, the currently available extended-release tablets are specifically designed for once-daily administration.
The 5mg dose specifically: When using felodipine 5 mg once daily, blood pressure can be measured at any time during the dosing interval (including just before the next dose) with confidence that therapeutic effect is maintained, as more than 75% of the peak effect persists at 24 hours 7.
Dose titration: If blood pressure control is inadequate with 5 mg once daily, the dose should be increased to 10 mg once daily rather than splitting to twice-daily dosing 1, 2, 3.