Not Recommended For Those…
Since this drug meddles with the entire working of your internal system as it inhibits many enzyme and chemical reaction either stop them from occurring of disturbs their usual routine in such cases those people who are already going through some instability through out their body, so in such state taking Cialis would do nothing but add fuel to the fire; make things go out of hand and bring dire consequences.
Those people having any medical history related to heart diseases, diabetes, high blood pressure, high cholesterol or pre-existing eye problems. They should seriously consider about taking a professional advice before taking this drug, as it primarily pry with the functioning of the heart and a little undesired can bring drastic eventualities. As it causes serious decrease in blood pressure that can lead to fainting, stroke or even heart attack.
Also a sudden loss of vision has been reported in some users, which is because of the sudden decrease of blood flow to the optic nerve of the eye and is limited to only those people who either smoke or are over 50 years of age.
It is also not recommended during pregnancy though there are no proofs that indicate that it passes into the breast milk or harm the new born but having said that; prevention is better than cure.