Generic Cialis and generic tadalafil are the different names for the same product. Actually, this drug is any medication that contains the chemical tadalafil. Generic tadalafil is used to cure erectile dysfunction in men and is highly popular as a prescription drug. Tadalafil works by increasing the blood flow to certain parts of the body by opening up the arteries. Generic Cialis or generic tadalafil can be taken only once per day and actually, once in three days is enough. This drug is not suitable for everyone. Age, physical condition and illnesses are factors that must be taken into account before using this drug. This is why a doctor�s prescription is so vital and this is also the reason why Cialis is a prescription drug. one thing is sure and that is this medication cannot be taken by everybody. Generic Cialis, i.e. generic tadalafil also causes certain side effects in some people. Some of the mild unwanted effects that occur are headaches, indigestion, flushing, nose block or aches in the body. Other serious side effects of this drug are heart burn, rashes or blurred vision. In spite of these negative effects of Cialis, it is a very effective drug and is hugely popular among men.