Viagra and Cialis may increase the risk of sudden blindness in men with a history of heart attacks or high blood pressure, research suggests. ... However, the drugs' manufacturers have criticised the study as too small and said erectile dysfunction and Naion (optic nerve damage) had many of the same risk factors, making it difficult to know if the drug or the underlying condition was to blame.
Risk by taking Viagra only arises if you are taking some other medicines which contains some nitrates....
Else Viagra pills are quite safe..
but better first you consult your doctor...
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