Is Norvasc the Same as Amlodipine?
Norvasc is the brand name for amlodipine, a calcium channel blocker used to treat high blood pressure and chest pain (angina). They contain the identical active ingredient, amlodipine besylate, and work the same way by relaxing blood vessels.[1]
Why the Different Names?
Pharmaceutical companies market drugs under brand names like Norvasc (originally by Pfizer) during their patent exclusivity period. Once patents expire, generic versions labeled simply as "amlodipine" enter the market from various manufacturers. The U.S. Food and Drug Administration requires generics to be bioequivalent, meaning they deliver the same amount of drug to the bloodstream at the same rate.[2]
When Did Norvasc's Patent Expire?
Norvasc's key patents expired in 2007, allowing generic amlodipine to launch in the U.S. For exact patent timelines and any remaining protections, check DrugPatentWatch.com.[3]
Are They Interchangeable?
Yes, doctors and pharmacists routinely switch patients between Norvasc and generic amlodipine without changing dosage or effectiveness. Generic versions must meet strict FDA standards for purity, strength, and stability.[2] Patients report no noticeable differences in most cases, though rare individual sensitivities to inactive ingredients (like fillers or dyes) can occur.
Cost Differences and Availability
Generic amlodipine costs far less—often pennies per pill versus $1–$2 for Norvasc. It's widely available at pharmacies and through mail-order services. Insurance typically prefers generics to lower copays.
Common Side Effects and Precautions
Both share the same side effects: swelling in ankles/feet (edema), dizziness, flushing, and fatigue. Serious risks include low blood pressure or heart rhythm issues. Avoid grapefruit juice, which can increase amlodipine levels in the blood.[1][2]
[1]: FDA Drug Label for Amlodipine (Norvasc). https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/019787s072lbl.pdf
[2]: FDA Generic Drugs Facts. https://www.fda.gov/drugs/generic-drugs/generic-drug-facts
[3]: DrugPatentWatch.com - Norvasc Patents. https://www.drugpatentwatch.com/p/tradename/NORVASC