Crushing Amlodipine Tablets
Yes, amlodipine tablets can be safely crushed for administration without affecting their therapeutic efficacy. 1, 2
Evidence for Crushing Amlodipine
Amlodipine is a calcium channel blocker that can be administered in crushed form when patients have difficulty swallowing tablets. The American Heart Association and American Thoracic Society guidelines specifically note that "amlodipine can be compounded into stable extemporaneous suspensions" 2, indicating that the medication remains stable when its physical form is altered.
The pediatric guidelines from the American Heart Association further support this by stating that amlodipine is one of the calcium channel blockers that can be prepared in alternative forms 1. This is in contrast to other calcium channel blockers like felodipine and extended-release nifedipine, which "must be swallowed whole" 1.
Administration Considerations
When crushing amlodipine tablets:
- Crush the tablet completely to ensure uniform dosing
- Mix with a small amount of soft food (e.g., applesauce) or liquid for easier administration
- Administer immediately after crushing to ensure full dose delivery
- Ensure the entire mixture is consumed to receive the complete dose
Important Distinctions from Other Calcium Channel Blockers
Not all calcium channel blockers can be crushed. The guidelines make important distinctions:
- Can be crushed: Amlodipine, immediate-release diltiazem, immediate-release verapamil
- Must NOT be crushed: Felodipine, extended-release nifedipine, extended-release diltiazem, extended-release verapamil 1, 3, 4
Crushing extended-release formulations can lead to dose dumping, potentially causing serious adverse effects including hypotension, dizziness, and reflex tachycardia 3, 4.
Potential Effects on Absorption
While amlodipine can be crushed, be aware that:
- Mixing crushed tablets with certain foods like jam may delay dissolution 5
- Mixing with thickened fluids (especially at higher thickness levels) can significantly delay dissolution and potentially affect bioavailability 5
Clinical Implications
Amlodipine has favorable pharmacokinetic properties that make it less susceptible to problems when crushed:
- Long half-life (40-60 hours) 6
- Once-daily dosing with minimal fluctuation in plasma concentration (20-25%) 6
- Gradual onset of action (peak plasma concentration at 6-8 hours) 6
These properties mean that minor variations in absorption rate from crushing are less likely to cause significant clinical effects compared to medications with shorter half-lives.
Conclusion
Amlodipine tablets can be safely crushed for patients who have difficulty swallowing. However, avoid mixing with thickened fluids or certain food vehicles like jam that may significantly delay dissolution. Always administer immediately after crushing to ensure proper dosing.