Cialis vs Viagra: How Similar Are They?

The constant advancements of modern medicine allow us to fight off a lot of diseases and medical conditions efficiently. As the years go by and science progresses even further, we are acquiring numerous new and different treatment options for a certain issue that are guaranteed to cover all types of patients.

One such case is erectile dysfunction. The two most popular drugs that are used to treat the condition are Viagra and Cialis. In this article we are going to compare these two so that potential users have a complete understanding of both before deciding which one suits them best.

Active ingredient

Both of the drugs’ active ingredients belong to the same group of substances called PDE-5 inhibitors. Cialis contains tadalafil while Viagra contains sildenafil.

Prescription requirement

They both require a doctor’s prescription to be purchased. However, there are quite many online pharmacies where these drugs can be bought anonymously without a prescription.

Mechanism of action

This is another feature they share since they practically belong to the same chemical category. Here is how they work: PDE-5 inhibitors block the action of cGMP-specific phosphodiesterase type 5, an enzyme that is “responsible” for the inability of men to achieve and maintain an erection.


Viagra and Cialis have rather similar costs, although the latter has a bit higher price as a rule. For instance, 20mg tablets of Cialis have an average cost between 10 and 14 dollars per tablet, depending on the number of pills you are purchasing. Viagra does not come in that dosage; the standard tablet of Viagra contains 100mg of sildenafil, for which you will have to pay about 10 dollars.

“Kick in” time

According to men who have tried both of the products, Cialis seems to be faster. It normally takes about 20 to 30 minutes for it to start working while there are cases where it was active only 15 minutes after consumption. Viagra is a bit slower and it normally takes about 30 minutes to an hour before the effects start appearing.


Cialis wins big in this category since it has been documented to last for about one day and a half (36 hours) while Viagra is active only for up to 6 hours after consumption.

Success rate

Viagra’s effectiveness has been tracked to be 81%, meaning it works for 8 out of every 10 men that have used it. Cialis’ rate is approximately the same, but for people who want to be precise and pay attention to details, it is actually 1% higher, reaching 82%.

How to consume

Cialis can be taken both on an empty or full stomach, the only restriction is grapefruit and greasy foods. Viagra is better used when the stomach is empty in order to avoid delay in the “kick in” time or reduced effectiveness levels.

Possible side effects

The side effects of Cialis have been documented to be a bit fewer than the ones of Viagra. Some of them are sudden flushing in the area of the face, blood pressure drop, congestion and dizziness. Viagra’s common side effects include, nausea, diarrhea and a sudden difficulty to distinguish between blue and green color. Headaches are a common side effect of both Cialis and Viagra.

It seems that Cialis is a little better choice than Viagra for a few reasons. For starters, it requires a smaller dosage to work, a characteristic that is a huge advantage for many men since it limits the potential side effects. Other than that, when compared to Viagra, Cialis has a way longer duration. The advantage of this trait is that there is no need to schedule the usage in a short period of time prior to sexual activity. Because of that property, Cialis has been given the nickname “The weekend pill“, since taking a single pill on a Saturday morning is guaranteed to last for almost the entire weekend.

However, the factors that are used as buying criteria may differ from one person to another, thus the final conclusion and choice depends on the consumer. Some consider the price to be the most important part, while others focus on the duration. There is also a chance that one drug might be simply more effective than the other for an individual, for reasons that have to do with how his body responds to each drug.