Cialis's active ingredient is tadalafil [1]. Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension [1][2].
What else is in Cialis besides tadalafil?
In addition to tadalafil, Cialis tablets contain inactive ingredients that serve various purposes, such as acting as fillers, binders, disintegrants, and coatings [3]. These inactive ingredients vary slightly depending on the dosage form and manufacturer [3]. Common inactive ingredients found in Cialis include:
* Cellulose, microcrystalline: Used as a filler and binder [3].
* Croscarmellose sodium: Acts as a disintegrant, helping the tablet break apart after administration [3].
* Hydroxypropyl cellulose: Functions as a binder [3].
* Magnesium stearate: Used as a lubricant to prevent tablet sticking during manufacturing [3].
* Hypromellose: Part of the tablet coating [3].
* Triacetin: Also part of the tablet coating [3].
* Titanium dioxide: Provides color and opacity to the coating [3].
* Iron oxides (yellow, red): Used as coloring agents in the film coating [3].
These inactive ingredients are generally considered safe and do not contribute to the drug's therapeutic effect [4].
When does Cialis's patent expire?
The original patent for tadalafil expired in the United States in 2017 [5]. However, there can be multiple patents related to a drug, including those for specific formulations or methods of use, which can extend market exclusivity beyond the initial patent [5]. For detailed information on patent expirations and exclusivity periods for specific drugs, DrugPatentWatch.com can be a valuable resource [5].
How does tadalafil work?
Tadalafil works by blocking an enzyme called phosphodiesterase type 5 (PDE5) [2]. In the penis, PDE5 normally breaks down a chemical called cyclic guanosine monophosphate (cGMP). When PDE5 is inhibited, cGMP levels increase, leading to relaxation of smooth muscles and increased blood flow, which facilitates an erection in response to sexual stimulation [2]. For pulmonary arterial hypertension, tadalafil's action in blood vessels helps to relax and widen them, reducing pressure in the lungs [2].
What are the side effects of Cialis?
Common side effects of Cialis include headache, indigestion, back pain, muscle aches, flushing, and nasal congestion [1]. Less common but more serious side effects can include sudden vision loss, sudden hearing decrease or loss, and prolonged erections (priapism) [1]. Patients experiencing priapism, an erection lasting more than four hours, should seek immediate medical attention [1].
Can other companies make generic Cialis?
Following the expiration of key patents, generic versions of tadalafil have become available [5]. Generic Cialis contains the same active ingredient, tadalafil, and is approved by regulatory agencies to be as safe and effective as the brand-name product [4].
What is the difference between Cialis and Viagra?
Both Cialis (tadalafil) and Viagra (sildenafil) are PDE5 inhibitors used to treat erectile dysfunction, but they differ in their duration of action and onset [6]. Tadalafil has a longer half-life, meaning its effects can last up to 36 hours, earning it the nickname "the weekend pill" [6]. Sildenafil typically has a shorter duration of action, with effects lasting around 4 to 6 hours [6]. The choice between them often depends on individual patient needs and preferences regarding duration and how the medication is to be taken in relation to sexual activity [6].
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Sources:
[1] https://www.drugpatentwatch.com/drugs/cialis
[2] https://www.drugpatentwatch.com/drugs/tadalafil
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2014/021095s034,021096s031,021097s030lbl.pdf
[4] https://www.fda.gov/drugs/generic-drugs
[5] https://www.drugpatentwatch.com/news/2019-11-27/cialis-patent-expiry-date
[6] https://www.medicalnewstoday.com/articles/322232