Hi,
It usually does not have such side effects like less semen genration and erection problem,but if you think you have been facing this problem just after you started having this drug or if you are facing any othere problem then you may ask your doctor to change your drug.
Viagra tablets are prescribed only after examination,so i would advice you to go for examination.
If you are not having erection or for a very litlle time,then you can take viagra after prescription.
Rest follow all the nat ...
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