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Stendra Side Effects Center

Medical Editor: John Cunha, DO, FACOEP

Stendra (avanafil) tablets are indicated for the treatment of erectile dysfunction. Common side effects of Stendra can include headache, flushing, stuffy nose, runny nose, sore throat, and back pain. Stendra may uncommonly cause an erection that will not go away (priapism); sudden loss of vision in one or both eyes; and/or sudden hearing decrease or hearing loss.

For most patients, the starting dose is 100 mg taken approximately 30 minutes before sexual activity, on an as needed basis. Stendra should not be taken more than once per day. The dose may be increased to 200 mg or decreased to 50 mg based on efficacy and/or tolerability, however, it is best to use the lowest beneficial dose. Stendra may interact with nitrates, alpha blockers, antihypertensives, alcohol, ketoconazole, ritonavir, antibiotics, and amlodipine. Tell your doctor all medications you use. Stendra is not indicated for use in women. There are no adequate and well-controlled studies of Stendra in pregnant women. Consult your doctor before breastfeeding.

Our Stendra Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Stendra FDA Prescribing Information: Side Effects
(Adverse Reactions)


Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

STENDRA was administered to 1923 men during clinical trials. In trials of STENDRA for use as needed, a total of 493 patients were exposed for greater than or equal to 6 months, and 153 patients were treated for greater than or equal to 12 months.

In three randomized, double-blind, placebo-controlled trials lasting up to 3 months in duration, the mean age of patients was 56.4 years (range from 23 to 88 years). 83.9% of patients were White, 13.8% were Black, 1.4% Asian, and < 1% Hispanic. 41.1% were current or previous smokers. 30.6% had diabetes mellitus.

The discontinuation rate due to adverse reactions for patients treated with STENDRA 50 mg, 100 mg, or 200 mg was 1.4%, 2.0%, and 2.0%, respectively, compared to 1.7% for placebo-treated patients.

Table 1 presents the adverse reactions reported when STENDRA was taken as recommended (on an as-needed basis) from these 3 clinical trials.

Table 1: Adverse Reactions Reported by Greater Than or Equal to 2% of Patients Treated with STENDRA From 3 Placebo-Controlled Clinical Trials Lasting 3 Months for STENDRA Use as Needed

Adverse Reaction  Placebo
(N = 349) 
(N = 217) 
STENDRA 100 mg
(N = 349) 
STENDRA 200 mg
(N = 352) 
Headache  1.70% 5.10% 6.90% 10.50%
Flushing  0.00% 3.20% 4.30% 4.00%
Nasal congestion  1.10% 1.80% 2.90% 2.00%
Nasopharyngitis  2.90% 0.90% 2.60% 3.40%
Back pain  1.10% 3.20% 2.00% 1.10%

Adverse reactions reported by greater than or equal to 1%, but less than 2% of patients in any STENDRA dose group, and greater than placebo included: upper respiratory infection (URI), bronchitis, influenza, sinusitis, sinus congestion, hypertension, dyspepsia, nausea, constipation, and rash.

In an, open-label, long-term extension study of two of these randomized, double-blind, placebo-controlled trials, the total duration of treatment was up to 52 weeks. Among the 712 patients who participated in this open-label extension study, the mean age of the population was 56.4 years (range from 23 to 88 years). The discontinuation rate due to adverse reactions for patients treated with STENDRA (50 mg, 100 mg, or 200 mg) was 2.8%.

In this extension trial, all eligible patients were initially assigned to STENDRA 100 mg. At any point during the trial, patients could request to have their dose of STENDRA increased to 200 mg or decreased to 50 mg based on their individual response to treatment. In total, 536 (approximately 75%) patients increased their dose to 200 mg and 5 (less than 1%) patients reduced their dose to 50 mg.

Table 2 presents the adverse reactions reported when STENDRA was taken as recommended (on an as-needed basis) in this open-label extension trial.

Table 2: Adverse Reactions Reported by Greater Than or Equal to 2% of Patients Treated With STENDRA in an Open-Label Extension Trial

 Adverse Reaction  STENDRA
(N = 711) 
Headache  5.60%
Flushing  3.50%
Nasopharyngitis  3.40%
Nasal congestion  2.10%

Adverse reactions reported by greater than or equal to 1%, but less than 2% of patients in the open-label extension study included: upper respiratory infection (URI), influenza, sinusitis, bronchitis, dizziness, back pain, arthralgia, hypertension, and diarrhea.

In an additional, randomized, double-blind, placebo-controlled study lasting up to 3 months in 298 men who had undergone bilateral nerve-sparing radical prostatectomy for prostate cancer, the mean age of patients was 58.4 years (range 40 - 70). Table 3 presents the adverse reactions reported in this study.

Table 3: Adverse Reactions Reported by Greater than or Equal to 2% of Patients Treated with STENDRA in a Placebo-Controlled Clinical Trial Lasting 3 Months in Patients Who Underwent Bilateral Nerve-Sparing Radical Prostatectomy

Adverse Reaction  Placebo
(N = 100) 
STENDRA 100 mg
(N = 99) 
STENDRA 200 mg
(N = 99) 
Headache  1.00% 8.10% 12.10%
Flushing  0.00% 5.10% 10.10%
Nasopharyngitis  0.00% 3.00% 5.10%
Upper respiratory infection  0.00% 2.00% 3.00%
Nasal congestion  1.00% 3.00% 1.00%
Back pain  1.00% 3.00% 2.00%
Electrocardiogram abnormal  0.00% 1.00% 3.00%
Dizziness  0.00% 1.00% 2.00%

Across all trials with any STENDRA dose, 1 patient reported a change in color vision.

The following events occurred in less than 1% of patients in the three placebo-controlled 3-month clinical trials and/or the open-label, long-term extension study lasting 12 months. A causal relationship to STENDRA is uncertain. Excluded from this list are those events that were minor, those with no plausible relation to drug use and reports too imprecise to be meaningful.

Body as a whole - edema peripheral, fatigue

Cardiovascular - angina, unstable angina, deep vein thrombosis, palpitations

Digestive - gastritis, gastroesophageal reflux disease, hypoglycemia, blood glucose increased, alanine aminotransferase increased, oropharyngeal pain, stomach discomfort, vomiting

Musculoskeletal - muscle spasms, musculoskeletal pain, myalgia, pain in extremity

Nervous - depression, insomnia, somnolence, vertigo

Respiratory - cough, dyspnea exertional, epistaxis, wheezing

Skin and Appendages - pruritus Urogenital - balanitis, erection increased, hematuria, nephrolithiasis, pollakiuria, urinary tract infection

Postmarketing Experience


Non-arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision including permanent loss of vision, has been reported rarely post-marketing in temporal association with the use of phosphodiesterase type 5 (PDE5) inhibitors. Most, but not all, of these patients had underlying anatomic or vascular risk factors for developing NAION, including but not necessarily limited to: low cup to disc ratio (“crowded disc”), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia and smoking. It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors, to the patient's underlying vascular risk factors or anatomical defects, to a combination of these factors, or to other factors [see WARNINGS AND PRECAUTIONS and PATIENT INFORMATION].

Read the entire FDA prescribing information for Stendra (Avanafil) »


Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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