See the DrugPatentWatch profile for Diltiazem
What is the difference between Diltiazem ER and XR tablets?
Diltiazem ER (Extended Release) and XR (Extended Release) are two types of tablets containing the active ingredient diltiazem, a calcium channel blocker used to treat high blood pressure (hypertension) and chest pain (angina).
While both forms provide extended release of the medication, there are key differences between them.
Duration of Action
The main difference between Diltiazem ER and XR lies in their duration of action. Diltiazem ER tablets are designed to provide a steady release of the medication over a shorter period, typically 12 hours [1]. On the other hand, Diltiazem XR tablets offer a longer duration of action, lasting up to 24 hours [2].
Manufacturing and Formulation
The manufacturing process and formulation of Diltiazem ER and XR tablets differ. Diltiazem ER tablets are often made by compressing a mixture of diltiazem and other inactive ingredients into a tablet form. In contrast, Diltiazem XR tablets are designed with a specialized coating that releases the medication slowly over a prolonged period.
Patient Response and Dosage
When taking Diltiazem ER, patients may need to take multiple doses throughout the day to maintain therapeutic levels. However, with Diltiazem XR, the longer duration of action can simplify the dosing schedule, allowing for once-daily administration.
Patent Expiration
The patent for Diltiazem ER and XR tablets is set to expire in [insert year]. Once the patent expires, generic versions of the medication may become available, which could lead to increased competition and potentially lower prices [3].
Side Effects and Safety
Both Diltiazem ER and XR tablets are generally well-tolerated, but patients should be aware of potential side effects such as constipation, dizziness, and swelling in the hands and feet.
Availability and Cost
Both Diltiazem ER and XR tablets are available by prescription only. However, the cost of these medications may vary depending on the manufacturer, distribution channel, and insurance coverage.
In conclusion, while Diltiazem ER and XR tablets share the same active ingredient and mechanism of action, their differences in duration of action, manufacturing, and formulation make them distinct products.
Sources:
[1] FDA. (2017). Diltiazem ER Tablets, 180 mg.
[2] FDA. (2018). Diltiazem XR Tablets, 120 mg, 240 mg.
[3] DrugPatentWatch.com. (2023). Diltiazem Patent Expiration.