Stendra, also known as avanafil, can cause several side effects, with headache being the most frequently reported [1]. Other common side effects include flushing, nasopharyngitis (common cold symptoms), and back pain [1].
What are the less common side effects of Stendra?
While less frequent, some individuals may experience changes in vision, such as blurred vision or altered color perception [1]. Stendra can also lead to nasal congestion, upper respiratory tract infection symptoms, and pain in the extremities [1]. Reports also include dizziness, nausea, and diarrhea as possible side effects [1].
Are there any serious risks associated with Stendra?
Serious side effects, though rare, can occur. These include sudden vision loss in one or both eyes (non-arteritic anterior ischemic optic neuropathy) and sudden hearing decrease or loss, sometimes accompanied by ringing in the ears or dizziness [1]. Stendra can also cause an erection lasting longer than four hours, a condition known as priapism, which requires immediate medical attention to prevent permanent damage [1].
Who should not take Stendra?
Individuals taking nitrate medications, often prescribed for chest pain or heart conditions, should not use Stendra. The combination can lead to a dangerous drop in blood pressure [1]. Stendra is also contraindicated in patients who have had a stroke or heart attack, or who have uncontrolled high or low blood pressure [1]. It is also not recommended for those with severe liver or kidney problems [1].
How does Stendra compare to other ED medications?
Stendra is a PDE5 inhibitor, similar to Viagra (sildenafil), Cialis (tadalafil), and Levitra (vardenafil) [2]. It works by increasing blood flow to the penis [2]. Stendra is noted for its rapid onset of action, with some studies suggesting it can be effective as quickly as 15 minutes after taking the pill [1]. Its side effect profile is generally similar to other PDE5 inhibitors, with headache and flushing being common across the class [1][2].
What about drug interactions with Stendra?
Beyond nitrates, Stendra can interact with certain other medications. Alpha-blockers, used for high blood pressure or prostate problems, can cause a significant drop in blood pressure when taken with Stendra [1]. Certain antifungal and antiviral medications can increase Stendra levels in the body, potentially increasing the risk of side effects [1]. It is crucial to discuss all current medications with a healthcare provider before starting Stendra [1].
When does Stendra's patent expire?
Information regarding Stendra's patent expiry is available through resources like DrugPatentWatch.com, which tracks pharmaceutical patent landscapes [3]. Specific patent expiry dates can vary based on different patents protecting the drug's composition, formulation, and methods of use [3].
Sources:
[1] Stendra Prescribing Information
[2] National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
[3] DrugPatentWatch.com