levitra viagra cialis comparacion

Cialis o Viagra

Cialis or Viagra or Levitra

Para empezar, diremos que no se trata de saber que es mejor. Hablamos Cialis, Viagra y Levitra, una comparacion inevitable, de acuerdo, sobre todo porque son farmacos cuyo fin es la disfuncion erectil, un problema que no todo el mundo esta dispuesto a confesar. Pero no se trata aqui de un Cialis vs Viagra. dado que lo que para un paciente son ventajas para el otro se vuelven inconvenientes.

Y, ya que no es una competicion, que este texto sea una forma de conocer mejor Cialis, Viagra y sus diferencias. De acuerdo, como hemos dicho antes, la meta es similar y, si se trata de las dos presentaciones mas fuertes de Cialis. el camino, identico: tomarse un comprimido entre media y una hora antes de iniciar una relacion sexual. Asimismo, en esta comparativa de Cialis con Viagra, las contraindicaciones son similares –aunque un poco mas amplias las de Viagra- y ninguno de los dos farmacos esta exento de efectos secundarios.

Ahora bien: si nos referimos a Cialis Diario, que se toma todos los dias mas o menos a la misma hora en una dosis de cinco miligramos, hemos de resaltar que los efectos son continuados y que las consecuencias no deseadas resultan mucho mas leves.

En cualquier caso, si hemos de elegir entre uno u otro medicamento para la disfuncion erectil, lo ideal es que sea el medico quien nos indique si hemos de usar Cialis, Viagra o Levitra. Al fin y al cabo, estamos jugando con la salud de una zona tan delicada que en ella intervienen al menos cuatro de los grandes sistemas de la anatomia humana.

Compare Viagra, Levitra, Cialis

When a man can’t get an erection to have sex or can’t keep an erection long enough to finish having sex, it’s called erectile dysfunction. Erectile dysfunction is the preferred term rather than the more commonly used term of impotence. Sexual dysfunction is often associated with disorders such as diabetes, hypertension, coronary artery disease, neurologic disorders, and depression. In some patients, sexual dysfunction may be the presenting symptom of such disorders. Additionally, ED is often an adverse effect of many medications.

Although there are a number of options available for non-surgical treatment of sexual dysfunction, it is clear that oral therapy has revolutionized the treatment approach to men with erectile dysfunction.

The FDA approved Viagra in 1998, and it became the first oral therapy for erectile dysfunction on the market. Vardenafil hydrochloride (Levitra) was approved in September, 2003, and Tadalafil (Cialis) was approved in November, 2003. Viagra, Levitra and Cialis work in much the same way. These PDE-5 inhibitors share many similarities, but they have differences as well.

Although sildenafil citrate (Viagra), vardenafil HCl (Levitra) and tadalafil (Cialis) sometimes are called sexual enhancers, they do not directly cause an erection of the penis, but alter the body’s response to sexual stimulation by enhancing the effect of the nitric oxide, a chemical that is normally released during stimulation. Nitric oxide causes relaxation of the muscles in the penis, which allows for better blood flow to the penile area.

PDE-5 inhibitors can be used to treat sexual dysfunction caused by high blood pressure, problems affecting nerve function, prostate surgery, side effects of medicines, emotional or psychological ED. Although they work in the similar way, they are not the same in all respects. Sildenafil and vardenafil have similar molecular structures, but tadalafil is structurally different.

  • The success rate of sildenafil amounts to an average of over 80%.
  • Several studies have shown a benefit of Viagra (sildenafil) for women with sexual arousal disorder, including an increased ability to lubricate, achieve orgasm, and experience sexual satisfaction.
  • Onset of action: 30-60 minutes.
  • Duration of action: up to 4 h.
  • Fatty food is known to delay the absorption of Viagra.
  • Contraindicated in persons taking organic nitrates; alpha-blockers (in the current labeling the interaction is considered a Precaution.)
  • Vision disturbances are more common after taking Viagra, than after other PDE-5 inhibitors. In July 2005, the FDA found that sildenafil could lead to vision impairment in rare cases and a number of studies have linked sildenafil use with nonarteritic anterior ischemic optic neuropathy.
  • The patent on Viagra expires in the early 2012.
  • Vardenafil is more potent and selective biochemically than other PDE-5 inhibitors.
  • Onset of action: 25 minutes (the quickest).
  • Duration of action is up to 5-6 hours, little longer than that reported for Viagra.
  • Not recommended in patients taking type 1A (such as quinidine, or procainamide) or type 3 antiarrhythmics (such as sotalol, or amiodarone).
  • The advantage that vardenafil has over sildenafil is that it does not alter color perception, a rare side effect which occurs with sildenafil (because vardenafil does not inhibit phosphodiesterase-6).
  • Vardenafil is contraindicated in patients taking organic nitrates, alpha-blockers (in the current labeling the interaction is considered a Precaution).
  • Fatty food delays the absorption of vardenafil. However, it is less sensitive than Viagra to food intake.
  • The patent on Levitra expires in 2018.
  • The most astounding feature of tadalafil is its length of action. It has long half life, which ensures 36-hour duration of effectiveness, allowing for more flexibility and spontaneity in sexual relations. This feature greatly distinguishes Cialis from its two predecessors Viagra and Levitra.
  • Onset of action: 16 to 30 minutes.
  • Tadalafil has the lowest prevalence of visual side effects. However, the myalgia seems to be more common with tadalafil, approaching 10%.
  • Tadalafil is contraindicated in patients taking organic nitrates, alpha-blockers.
  • Cialis is protected by a patent until 2016.

From a safety perspective, all three Viagra, Levitra and Cialis share similar drug interactions involving CY3A4 inhibitors and a contraindication in the use of nitrates. The side effects are similar for all three PDE-5 inhibitors and include headache, flushing, nasal congestion, and dyspepsia.

Which is better Viagra, Cialis or Levitra?

Cialis clearly works for 36 hours or more, making it an ideal choice for men who are very sexually active.

For men who develop angina and therefore might require an organic nitrate (such as nitroglycerine), the longer duration of action is a disadvantage. Also, some people are uncomfortable having the active ingredient in their system for an extended period of time.

Levitra works a little longer than Viagra, and gives a quite sufficient window of effectiveness for spontaneous sexual experience. Vardenafil is the most potent molecule of all PDE-5 inhibitors and works better in hard-to-treat cases of impotence [2].

Viagra clearly works for women with sexual arousal disorder [1].

Implicit advantage of Viagra: Many men have been ordering high-dose pills and splitting them, because Pfizer’s Viagra blue pills are pretty large (14mm) and easy to split.

Levitra, a small hard orange 8mm pill, is much more difficult to cut. Cialis 12mm pills are also inconvenient to split because of their asymmetrical almond shape.

Keep in mind that you don’t have to make a definitive choice and stay on one ED medication all the time. You can choose all three and alternate between them depending on your requirements. For example, Viagra or Levitra on weekdays and Cialis on weekend or holiday.

  • 1. Schoen C, Bachmann G. Sildenafil citrate for female sexual arousal disorder: a future possibility? Nat Rev Urol. 2009 Apr;6(4):216-22.
  • 2. Wang HY, Huang YF. Vardenafil for refractory erectile dysfunction: the latest advances. Zhonghua Nan Ke Xue. 2009 Nov;15(11):1035-8.

Last Updated: December 14, 2013

Comparison of Viagra, Levitra and Cialis

Male sexual dysfunction is one of the most common health problems affecting men and is more common with increasing age. Chronic ED affects about 5% of men in their 40s and 15пїЅ25% of men by the age of 65. Transient ED and inadequate erection affect as many as 50% of men between the ages of 40 and 70.

In around 95% of the cases, a satisfactory treatment can be found. Erectile dysfunction is treatable at any age, and awareness of this fact has been growing. More men have been seeking help and returning to normal sexual activity because of improved, successful treatments for erectile dysfunction.

Three PDE-5 inhibitors

Currently, there are three oral medications approved by the FDA for the treatment of erectile dysfunction: sildenafil (Viagra), vardenafil (Levitra), and tadalafil (Cialis). They block the enzyme phosphodiesterase type 5 (PDE-5) and belong to a class called phosphodiesterase (PDE) inhibitors.

Since introduction of the first PDE-5 inhibitor Viagra, there has been a fundamental change in the treatment of erectile dysfunction. Although there are a number of options available for non-surgical treatment, it is clear that oral therapy has revolutionized the treatment approach to patients with erectile dysfunction. The development of the PDE-5 inhibitors Levitra and Cialis prompts the question of whether and how these sexual medications differ in terms of their efficacy and adverse effects.

Viagra was the first and is probably the most famous of the three PDE-5 inhibitors used to treat erectile dysfunction. Viagra was approved for erectile dysfunction in March 27, 1998. Viagra is manufactured by Pfizer, Inc.

Levitra was the second PDE-5 inhibitor to come to market in the United States, and it was approved by the FDA in August 19, 2003. Levitra is manufactured by Bayer Pharmaceuticals Corporation.

Cialis was the third PDE-5 inhibitor to come to market in the United States and was approved by the FDA at the end of November 21, 2003. Cialis is manufactured by Lilly ICOS LLC.

The major advantage of these medications for sexual enhancement is that they do not cause an erection at inappropriate times, because they act only in response to sexual stimulation. If there is no sexual stimulation drug remains in the background. All three are taken orally prior to planned sexual activity, acting to increase blood flow in the penis in response to sexual stimulation. However, there are important differences between the three, differences that could influence safety, specificity, duration of action, adverse effects, and ultimately, public acceptance within this class.

back pain, muscle aches, nasal congestion, facial flushing, dizziness

Mechanism of action

Sildenafil, vardenafil, and tadalafil do not directly cause an erection of the penis, but they alter the body’s response to sexual stimulation by enhancing the effect of the nitric oxide, a chemical that is normally released during stimulation. Nitric oxide causes relaxation of the muscles in the penis, which allows for better blood flow to the penile area.

All PDE-5 inhibitors have demonstrated excellent efficacy in general and in specific populations (eg, men with diabetes mellitus or those who have undergone radical prostatectomy). Viagra, at 84%, is slightly more effective than Levitra at 80% and Cialis at 81%.

Viagra and Levitra differ only minimally in terms of their structure, while Cialis differs markedly from Viagra and Levitra in terms of its molecular structure, which is also reflected in pharmacokinetic differences.

  • Viagra. 25 mg, 50 mg 100 mg tablets
    • Onset of action. 30 minutes (effect delayed if taken with food)
    • Duration of action. 4 to 5 hours
  • Levitra. 2.5 mg, 5 mg, 10 mg, 20 mg tablets
    • Onset of action. 25 minutes (effect delayed by fatty meal)
    • Duration of action. 4 to 5 hours
  • Cialis. 5 mg, 10 mg, 20 mg tablets
    • Onset of action. 16-45 minutes (effect NOT delayed by food)
    • Duration of action. 36 hours

Viagra does not work as well as it would otherwise if you eat a high-fat meal around the time you take it. Viagra should be taken on an empty stomach. Levitra may be slightly less effective if you eat a high-fat meal, but a moderate-fat meal does not reduce its effectiveness. Cialis works without regard to what you eat.

Viagra and Levitra have similar half-lives, and onset and duration of action. Cialis has a slower onset of action and longer duration of action, which is attributed to its longer half-life.

Men who wish for spontaneity may opt for Cialis, which may allow for successful intercourse up to 36 hours postdose, even though it takes longer to reach peak effect. The considerably longer duration of effect for Cialis will likely allow less frequent dosing and greater impulsiveness between partners, but also could potentially prolong adverse effects.

PDE-5 inhibitors are primarily excreted via the fecal route with varying percentages eliminated renally.

The recommended dose for Viagra is 50 mg, and the physician may adjust this dose to 100 mg or 25 mg, depending on the patient.

The recommended dose for either Levitra or Cialis is 10 mg, and the physician may adjust this dose to 20 mg if 10 mg is insufficient. A lower dose of 5 mg is available for men who take other medicines or have conditions that may decrease the body’s ability to use the drug. Levitra is also available in a 2.5 mg dose.

None of these PDE-5 inhibitors should be used more than once a day.

Most common side effects:

  • Viagra. headache, epistaxis, flushing, indigestion, dizziness, nasal congestion, abnormal vision
  • Levitra. headache, flushing, indigestion, nausea, dizziness, nasal congestion
  • Cialis. headache, indigestion, back pain

PDE-5 inhibitors are generally well tolerated. Side effects include headache, flushing, dyspepsia, and nasal congestion.

Visual abnormalities are encountered with Viagra, but are less likely with Levitra and unlikely with Cialis. Flushing and dyspepsia that are associated with Viagra and Levitra are less common with Cialis. Back pain and muscle aches (myalgia) may occur with Cialis, but are unusual with either Viagra or Levitra. Side effects of Cialis tend to last longer, but are less marked than with the other drugs.

Precautions and contraindications

All PDE-5 inhibitors are absolutely contraindicated in persons who take organic nitrates, because they induce vasodilation.

The FDA no longer considers concomitant use of alpha-blockers a contraindication to use of PDE-5 inhibitors. However, persons on alpha-blockers must be on a stable dose of alpha-blocker prior to using a PDE-5 inhibitor.

Since both Viagra and Levitra have moderate vasodilatory and hypotensive effects, they should not be given in the presence of marked arterial or orthostatic hypotension, and should only be administered with caution in aortic stenosis or hypertrophic obstructive cardiomyopathy.

Men who have had a heart attack or stroke within the past 6 months and those with certain medical conditions (e.g. uncontrolled high blood pressure, severe low blood pressure or liver disease, unstable angina) that make sexual activity inadvisable should not take Cialis. Dosages of the drug should be limited in patients with kidney or liver disorders.

The differences between the 3 drugs are not great. All appear to be effective and safe. Levitra has less side effects compared to Viagra and lasts about the same time as Viagra in the body. Cialis has few side effects and lasts longer in the body to increase spontaneity than either Levitra or Viagra and there is no reduction in absorption when Cialis is taken with food. However, the longer half-life imposes increased risk for drug interactions.

  • 1. The Merck Manual of Medical Information. Mark H. Beers et al. eds. 2nd Home Edition. Whitehouse Station, NJ: Merck; 2003.
  • 2. Doggrell SA. Comparison of clinical trials with sildenafil, vardenafil and tadalafil in erectile dysfunction. Expert Opin Pharmacother. 2005 Jan;6(1):75-84.
  • 3. Viagra Prescribing Information PDF
  • 4. Levitra Prescribing Information PDF
  • 5. Cialis Prescribing Information PDF

Published: May 05, 2007
Last updated: March 24, 2016

ACC 206 Week 2 Chapter 2 Exercise 3
xenical tabletki cena
xenical dr simi
dissertation signature page ou dissent history
hace efecto el xenical
learn more here
click at this page
http://thefactsproject.org/map107.php
click the following article
xenical orlistat nebenwirkungen
xenical e controlado
FIN 534 Quiz 3 (15 questions with answers) 99,99 % Scored)
learn more here
xenical opis leku
http://imamsrabbis.org/map299.php
http://hsn.org.np/blog/map14.php
research papers on prayer in schools
how to reference dissertation apa 6th edition
donde comprar xenical sin receta
click here

Share on Facebook

Fikradaha Akhristayaasha (0)




.

 
/