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Sildenafil and Tiredness: What Users Say

Brand names: Viagra, Revatio

Tiredness: mentioned by 7 users (1.4%)

Based on user experiences from 499 Sildenafil reviews, the following table shows the most commonly mentioned side effects.

All user comments are moderated by Drugs.com. Each review is verified for relevance and screened for inappropriate content. Side effects are user-reported and not clinically verified.

headaches 14.8%
flushing 5.2%
runny nose 3.6%
stuffy nose 1.4%
tiredness 1.4%
insomnia 1.2%
anxiety 1.0%
ejaculation problems 1.0%
dizziness 0.8%
sexual dysfunction 0.8%

Reviews for Sildenafil

Commonly mentioned side effects
  • Wor...
  • Taken for less than 1 month
  • January 23, 2015

Sildenafil for Erectile Dysfunction "I'm a 66-year-old, never had problems with erection until a few months ago. When separated from my wife, I had anxiety and felt insecure with another woman. Took Viagra 50 mg and I was a rock star, anytime she wanted, I was ready. She was exhausted, and she is 46 years old. She can't stop calling me now, she wants more and more."

10 / 10
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229 Report
  • sam...
  • Taken for 10 years or more
  • June 7, 2015

Sildenafil for Erectile Dysfunction "I was 50 and had ED when I met this young woman, initially did not know what was wrong as I could not perform and had to abandon the act with excuses. A month later, I was prescribed 50 mg and took it an hour before, and it worked fine as we both had a good time twice in one night. I was exhausted in the morning, had a slight headache, and felt heat on the body during the night but was fine the next morning. Since then, it has been 12 years as I am 62 now, and I have taken this miracle drug of 50 mg every weekend when we make love, and it works great. Even though I have controlled my BP drug medication, the last 12 years have been great with Viagra. I only hope it will help until I am 65 when I would probably say goodbye to sex."

9 / 10
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64 Report
  • Anonymous
  • August 12, 2009

Sildenafil for Erectile Dysfunction "Yes, I achieved good erections after about 40 to 50 minutes and yes, I could repeat the experience a week or two later; however, the side effects drove me away from it. Side effects: Annoyance, blue-tinted vision lasting about 2 hours. First, migraine-like headaches. No conventional medicines would relieve the pain, sensitivity to light, nausea, and lethargy. The most disturbing was difficulty swallowing for about 3-4 hours. I ended up switching to 'Levitra'. Only a mild headache and some other minor effects for 2-3 hours. Not quite as good of an erection though (80% to 90% as good)."

2 / 10
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84 Report

Frequently asked questions

  • Anonymous
  • Taken for 5 to 10 years
  • July 1, 2020

Sildenafil for Pulmonary Arterial Hypertension "Revatio was prescribed by my pulmonary doctor for PAH. A miracle drug that helped me breathe better, I was able to exercise and felt great. After changing insurance carriers, I am no longer able to get Revatio, and I can tell how my body feels lethargic and I have spells of hard to breathe all day long now. Sad, but health care and insurance don't go hand in hand to help us that actually need this med, as it is extremely expensive. My 90-day supply of 10 mg, 3 times a day med cost almost 3,000.00, but my copay was only 60.00. Since I lost that insurance, I can no longer get Revatio."

10 / 10
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28 Report
  • Joe...
  • Taken for less than 1 month
  • February 12, 2020

For Erectile Dysfunction "I'm 64 years old and never needed any help in bed, but recently things have taken a downturn. When I mentioned it to my doctor, he was quick to prescribe Viagra to be taken one hour before needed. The pharmacist suggested sildenafil 100mg instead as a cheaper brand with the same characteristics and effect. It does absolutely nothing. Took one at 21:40, jumped in the shower, shaved, manicured, went to bed, and followed a bit of Facebook with my wife; started massaging her, but at 12 midnight still nothing. If so, making me so tired, sleepy, and frustrated. I think I should take it back to the pharmacist with a complaint. If we buy any other product and find it to be faulty or simply don't work, aren't we entitled to get our money back or another item that works? Why not for medication as well? Food for thought."

1 / 10
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42 Report

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  • Anonymous
  • March 8, 2009

Sildenafil for Erectile Dysfunction "I found it very effective. I maintained an extremely firm erection within the 4-hour period. Side effects were occasional runny nose and a tired eyes feeling. An unexpected side effect was increased blood flow to the area up until the next day occasionally and could get and maintain an erection."

10 / 10
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67 Report
  • Shi...
  • March 5, 2011

Sildenafil "I'm a married 45-year-old Australian male of good fitness and health (BMI=25). Although I probably wouldn't say I had erectile dysfunction, I found our sex life non-existent and found after only one very short 'round' I just couldn't get it up again. After taking Viagra - AMAZING. It was like my body was 18 years old again. First erection after ~50 minutes from taking the pill, and the erections of steel easily lasted about 8-10 hours. My wife does not know I have taken Viagra but was pleasantly shocked by about 6 'full-on' rounds in bed in 10 hours! Yes, I had mild side effects, so I probably couldn't use it every day. Mild headaches, sinus congestion, and tiredness."

9 / 10
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40 Report

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Reviews may be edited to correct grammar/spelling or remove inappropriate content. Reviews appearing to come from parties with a vested interest are not published. This information is not intended to endorse any medication and should not replace the expertise and judgment of healthcare professionals.