Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. The active ingredient in naproxen is naproxen sodium [1].
What else is in naproxen medications?
Beyond naproxen sodium, over-the-counter and prescription naproxen products contain several inactive ingredients. These are added for various purposes, such as binding the tablet, providing color, or aiding in disintegration. Specific inactive ingredients can vary by manufacturer and product formulation. Common inactive ingredients found in naproxen tablets include microcrystalline cellulose, povidone, croscarmellose sodium, magnesium stearate, and hypromellose [2]. Some formulations may also contain titanium dioxide for color, and polyethylene glycol [2].
How does naproxen work?
Naproxen works by inhibiting enzymes called cyclooxygenase (COX-1 and COX-2) [3]. These enzymes are involved in the production of prostaglandins, which are chemicals that promote inflammation, pain, and fever [3]. By blocking these enzymes, naproxen reduces the levels of prostaglandins, thereby alleviating these symptoms [3].
When does naproxen patent protection end?
Naproxen has been available for many years, and its original patents have long expired. This has allowed for the development and marketing of numerous generic versions of naproxen [4]. Information on patent expiry for specific formulations or newer uses of naproxen can be found on specialized patent tracking websites [4].
Are there different types of naproxen?
Naproxen is available in various forms, including immediate-release tablets, extended-release tablets, and liquid suspensions [1]. It is also commonly combined with other active ingredients, such as pseudoephedrine, for the relief of cold and sinus symptoms [1]. The concentration of naproxen can also vary, with common strengths for over-the-counter use being 220 mg (naproxen sodium) and for prescription use being 250 mg, 275 mg, 375 mg, and 500 mg (naproxen sodium) [1].
What are the side effects of naproxen?
Like all medications, naproxen can cause side effects. Common side effects include stomach upset, nausea, heartburn, dizziness, and drowsiness [5]. More serious side effects can occur, such as gastrointestinal bleeding, ulcers, heart attack, stroke, and kidney problems [5]. Patients with a history of stomach ulcers, bleeding disorders, or certain heart conditions should use naproxen with caution and consult a healthcare professional [5].
How does naproxen compare to ibuprofen?
Naproxen and ibuprofen are both NSAIDs and work similarly by blocking COX enzymes [6]. However, they differ in their duration of action. Naproxen generally has a longer-lasting effect, allowing for less frequent dosing compared to ibuprofen [6]. Ibuprofen is typically taken every 4 to 6 hours, while naproxen is often taken every 8 to 12 hours [6]. Both medications carry similar risks of gastrointestinal and cardiovascular side effects [6].
Can I take naproxen with other medications?
It is important to inform a healthcare provider about all medications being taken before starting naproxen, as it can interact with other drugs [5]. Naproxen can increase the risk of bleeding when taken with anticoagulants (blood thinners) like warfarin, or with other NSAIDs or aspirin [5]. It can also interact with certain blood pressure medications and diuretics [5].
Where can I find more information on naproxen patents?
For detailed information on naproxen patents, including expiry dates and any ongoing litigation, specialized resources like DrugPatentWatch.com can be valuable [4]. These platforms track patent information for pharmaceuticals, offering insights into intellectual property for both branded and generic drugs [4].
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Cited Sources
1. https://www.yalemedicine.org/conditions/pain-management/naproxen-for-pain-relief
2. https://www.drugs.com/inactive/naproxen-992.html
3. https://www.ncbi.nlm.nih.gov/books/NBK548430/
4. https://drugpatentwatch.com/
5. https://www.mayoclinic.org/drugs-supplements/naproxen-oral-route/side-effects/drg-20069805
6. https://www.nhs.uk/medicines/naproxen/