Fildena

Common use
Fildena is a medication to treat erectile dysfunction in men. This an analog version of Viagra, or sildenafil citrate, which is used for treatment of sexual dysfunction in men. Fildena increases amount of blood passing to the penis.

Dosage and direction
100mg Fildena dose effects in 45 minutes and last during 4-6 hours.

Precautions
Before to take Fildena notify your doctor if you suffer from allergies, anemia, eye diseases, cancer, high blood pressure or low blood pressure, irregular heart rhythm, heart failure, unstable chest pain, certain eye disorders, deformation of the penis or have history of such conditions or take protease inhibitors for the treatment of HIV. Do not stand up fast from a lying or sitting position. Avoid drinking alcohol as it may worsen side effects. Do not take Fildena if you have already taken another ED medication. Warn your doctor before to take Fildena if you use alprostadil (Caverject, Muse, Edex) or yohimbine (Yocon, Yodoxin, others).

Contraindications
Fildena is contraindicated in patients with allergy to the medication or those who are treated with nitrates (such as nitroglycerin). This combination can result in very low blood pressure that can lead to a stroke, a heart attack, or death. Do not take this medication if you are under 18 y.o.

Possible side effects
Some patients may experience headache, diarrhea, dizziness, upset stomach, vomiting, nasal congestion. Such adverse effect like face blushing may be less expressed than in individuals taking Viagra. Fildena can cause a rare but serious condition known as priapism or prolonged erection. Contact your health care provider at once if your erection continues longer than for hours.

Drug interactions
Fildena should not be prescribed to patients treated with medications which contain organic nitrates. Fildena blood levels are raised by erythromycin, ketoconazole, itraconazole and saquinavir. These medications are known to interact with Fildena: bosentan (Tracleer); cimetidine (Tagamet, Tagamet HB); an antibiotic such as erythromycin (E-Mycin, Eryc, Ery-Tab) or clarithromycin (Biaxin); doxazosin (Cardura), prazosin (Minipress), Terazosin (Hytrin); HIV medicines such as indinavir (Crixivan), amprenavir (Agenerase), darunavir (Prezista), efavirenz (Sustiva), tipranavir (Aptivus), nevirapine (Viramune), saquinavir (Invirase, Fortovase), lopinavir/ ritonavir (Kaletra), fosamprenavir (Lexiva), ritonavir (Norvir), atazanavir (Reyataz), or nelfinavir (Viracept); an antifungal medication such as itraconazole (Sporanox) or ketoconazole (Nizoral); carbamazepine (Tegretol), phenobarbital (Luminal), or phenytoin (Dilantin); or rifampin (Rifadin, Rimactane) or rifabutin (Mycobutin).

Missed dose
Fildena is taken when needed so a missed dose is not supposed.

Overdose
If you overdosed Fildena you may experience fainting, chest pain, nausea, irregular heartbeat, lightheadedness. Seek for immediate medical help if so.

Storage
Store at room temperature away from moisture, sunlight, kids and pets in a tight container.

Disclaimer
We provide only general information about medications which does not cover all directions, possible drug integrations, or precautions. Information at the site cannot be used for self-treatment and self-diagnosis. Апу specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. We disclaim reliability of this information and mistakes it could contain. We are not responsible for any direct, indirect, special or other indirect damage as a result of any use of the information on this site and also for consequences of self-treatment.

Clinical Verification

Last Clinically Updated: August 15, 2026

Written By

Dr. Elena Vance, PharmD

Clinical Specialist in Neuropharmacology

Fact Checked By

Marcus Thorne, MS

Biomedical Data & FDA Label Verification

Medically Reviewed By

Dr. Arthur Campbell, MD

Board-Certified Psychiatrist (ABPN)