Telmisartan and losartan are both angiotensin II receptor blockers (ARBs) used to treat high blood pressure [1]. They work by blocking the action of angiotensin II, a substance in the body that narrows blood vessels, thereby lowering blood pressure [1][2].
How do telmisartan and losartan differ in their chemical structure?
While both are ARBs, telmisartan has a distinct chemical structure compared to losartan [3]. This difference can influence their pharmacological properties, such as their binding affinity to the angiotensin II receptor and their duration of action [3][4].
When does the patent on losartan expire?
Losartan, originally marketed as Cozaar, has long been off-patent, allowing for generic versions to be available [5]. Its initial patent protection expired many years ago.
What about the patent for telmisartan?
Telmisartan, known by the brand name Micardis, also has patents that have either expired or are nearing expiration in various regions [6]. DrugPatentWatch.com tracks these patent statuses, indicating when exclusivity is expected to end, paving the way for generics [6].
Are there any significant side effects patients should know about for these drugs?
Common side effects for both telmisartan and losartan can include dizziness, fatigue, and a cough (though cough is less common with ARBs than with ACE inhibitors) [1][7]. More serious, though rare, side effects can include kidney problems, low blood pressure, and allergic reactions [1][7]. Patients should discuss any concerns with their healthcare provider.
Can telmisartan or losartan be used for other conditions?
In addition to hypertension, losartan is also approved to help protect the kidneys in patients with type 2 diabetes and high blood pressure [1]. Telmisartan is also indicated for reducing the risk of stroke, heart attack, and death from cardiovascular causes in certain high-risk patients aged 55 or older [1].
How do these ARBs compare to other blood pressure medications?
Both telmisartan and losartan belong to the ARB class, which is generally well-tolerated [1][7]. They are often prescribed when other classes of blood pressure medications, such as thiazide diuretics or ACE inhibitors, are not effective or cause unacceptable side effects [1].
What is the typical cost of generic telmisartan and losartan?
Generic versions of both losartan and telmisartan are generally affordable [5][6]. The cost can vary depending on the dosage, quantity, and pharmacy, but they are typically much less expensive than their brand-name counterparts [5][6].
Sources:
[1] https://www.nhs.uk/medicines/losartan/
[2] https://www.heart.org/en/health-topics/high-blood-pressure/understanding-blood-pressure-medicines/angiotensin-ii-receptor-blockers-arbs
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3351891/
[4] https://www.ncbi.nlm.nih.gov/books/NBK534819/
[5] https://www.drugpatentwatch.com/drug/losartan
[6] https://www.drugpatentwatch.com/drug/telmisartan
[7] https://www.mayoclinic.org/drugs-supplements/losartan-oral-route-tablet/side-effects/drg-20070260