Which medication is prescribed when sildenafil proves to be ineffective? Select one: a. Stendra b. Cialis c. Levitra d. Revatio
The correct answer and explanation is:
Correct Answer: c. Levitra
When sildenafil (commonly known as Viagra) proves ineffective in treating erectile dysfunction (ED), another phosphodiesterase type 5 (PDE5) inhibitor may be prescribed as an alternative. In this case, Levitra, which contains the active ingredient vardenafil, is often chosen. It works in a similar way to sildenafil by enhancing blood flow to the penis during sexual stimulation, but it may offer different results in certain individuals due to differences in chemical structure, metabolism, and patient response.
Levitra is known for having a slightly faster onset of action and may work better for men who do not respond to sildenafil. It can be effective within 25 to 60 minutes and has a duration of action of about 4 to 5 hours. It is particularly useful for men with diabetes or those who did not see improvement with sildenafil.
Other options like Cialis (tadalafil) and Stendra (avanafil) are also PDE5 inhibitors and could be considered, but the question specifically asks for the medication typically prescribed when sildenafil fails. Among the choices, Levitra is most often tried next due to its similar but slightly more potent and selective action.
Revatio is a brand name for sildenafil but is used to treat pulmonary arterial hypertension, not erectile dysfunction. Therefore, it is not an appropriate substitute in this context.
Doctors may also evaluate factors such as timing of medication, food intake, underlying health issues, or psychological factors that could be affecting the efficacy of sildenafil. If PDE5 inhibitors do not work at all, other treatments such as penile injections, vacuum erection devices, or surgical implants may be considered. However, among oral medications, Levitra is a logical next step.