Medically reviewed by Dr. Sarah Mitchell, RPh, Clinical Pharmacist — Updated January 2026
How Does Cialis (Tadalafil) Work?
Cialis works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. When a man is sexually stimulated, tadalafil relaxes the smooth muscle in the blood vessels of the penis, allowing increased blood flow that results in a firm and lasting erection. Crucially, the medication only works in response to sexual stimulation — it does not produce an erection on its own.
Tadalafil begins to work within 30 minutes to 1 hour after taking the dose. Unlike sildenafil (Viagra), which remains effective for 4 to 6 hours, tadalafil stays active in the body for up to 36 hours. This extended window means you do not need to time the medication precisely around sexual activity, giving you and your partner a much more natural and spontaneous experience.
Cialis Generic vs Brand Cialis: Is There a Difference?
Generic Cialis contains the identical active ingredient — tadalafil — at the same dosage and to the same pharmaceutical standards as brand-name Cialis manufactured by Eli Lilly. The only differences are the name, packaging, and price. Generic manufacturers are required to demonstrate bioequivalence, meaning the generic version is absorbed into the bloodstream at the same rate and to the same extent as the original.
In Canadian pharmacies, brand-name Cialis 20mg typically costs between C$25 and C$35 per tablet. Generic tadalafil available online starts from under C$1 per tablet — delivering identical therapeutic results at roughly 3–5% of the brand price.
Cialis vs Viagra: Which Is Right for You?
Both Cialis (tadalafil) and Viagra (sildenafil) are PDE5 inhibitors that treat erectile dysfunction effectively, but they differ significantly in duration, dosing flexibility, and side effect profile. Here is how they compare:
| Cialis Generic (Tadalafil) | Viagra Generic (Sildenafil) | |
|---|---|---|
| Active ingredient | Tadalafil | Sildenafil citrate |
| Onset of action | 30–60 minutes | 30–60 minutes |
| Duration of effect | Up to 36 hours | 4–6 hours |
| Available for daily use | Yes (2.5mg / 5mg) | No |
| Effect of food | Minimal — can be taken with meals | Reduced by high-fat meals |
| Effect of alcohol | Moderate caution advised | Moderate caution advised |
| Back/muscle pain | Possible (unique to tadalafil) | Rare |
| Visual disturbances | Rare | Occasional (blue tinge) |
| Price per pill (online, Canada) | From C$0.78 | From C$0.64 |
| Best for | Spontaneity, frequent activity, daily use | Planned encounters |
The most important practical difference is duration. If you prefer not to plan around a pill and want a full weekend of spontaneous readiness from a single dose, Cialis is generally the better choice. If you have occasional planned encounters and want the lowest possible cost per dose, Viagra generic is equally effective.
Dosage of Cialis Generic (Tadalafil)
When it comes to dosage options, Cialis generic (Tadalafil) offers flexibility to suit different needs and treatment plans. Online pharmacies typically provide a range of dosage strengths, allowing you to select the most suitable dose for your condition and lifestyle.
Common Dosage Strengths
- 2.5 mg and 5 mg: These low doses are usually prescribed for daily use. Taking Cialis daily at this dosage helps men who have frequent sexual activity maintain readiness without needing to time the medication before intercourse. The usual recommendation is 5 mg once per day, taken at the same time every day for best results.
- 10 mg and 20 mg: These higher doses are taken on an as-needed basis, about 30 minutes before planned sexual activity. The typical starting dose is 10 mg. If this dose is not effective, the doctor may increase it to 20 mg. If side effects occur, a dose reduction to 5 mg may be advised.
A range of doses allows personalized treatment tailored to lifestyle and frequency of sexual activity.
How to Take Cialis Generic
- For daily use, take one tablet at the same time each day regardless of sexual activity. This steady approach maintains a consistent level of the drug in your bloodstream.
- For occasional use, take one tablet (usually 10 mg) approximately 30 to 60 minutes prior to sexual activity. Cialis’s effects can last up to 36 hours, providing a wide window for intimacy.
- Do not take more than one dose in a 24-hour period to avoid increased risk of side effects.
Following timing and dosage recommendations is key for safety and effectiveness.
Choosing the Right Dose
- Your healthcare provider will recommend your starting dose based on factors such as your overall health, response to treatment, and frequency of sexual activity.
- For occasional users who have never taken Cialis before, 10 mg is generally the starting dose.
- For daily users who have frequent sexual activity (more than twice a week), doses of 2.5 mg or 5 mg daily may be more appropriate.
- If lower doses do not provide the desired effect, your doctor can adjust the dose while monitoring tolerability.
Dose selection and adjustment should always be guided by a healthcare professional.
Convenience of Buying Cialis Generic Online
Purchasing Cialis generic online offers convenience and privacy. You can order different dosage strengths easily and receive your medication discreetly at home. Many Canadian users benefit from buying Cialis generic online without prescription at reliable online pharmacies like drugs-canada.com, which provide fast delivery across Canada.
Cialis online over the counter
- Cialis generic online refers to the generic version of the drug Cialis, which is used to treat erectile dysfunction.
- Tadalafil is the active ingredient of Cialis generic online as in the branded version.
- The main advantage of buying Cialis generic online is the lower cost as compared to the branded version.
- Cialis generic online comes in different dosages, allowing people to choose the most suitable dosage for their needs.
- Buying Cialis generic online is a convenient and confidential way to get the medication without having to consult a doctor in person.Are there any side effects of taking cialis generic online?
Buying generic Cialis online is an economical, convenient and discreet option for treating erectile dysfunction. The active component of the drug - tadalafil - provides the same effectiveness as the branded version. The availability of different dosages allows you to choose the drug according to your specific needs. However, it is important to remember about possible side effects and consult a doctor in case of any problems.
Side effects - Cialis Tadalafil
Like any medication, Cialis can have side effects. However, it's important to note that not everyone experiences these side effects, and they can vary in severity from person to person. Common side effects of Cialis may include:
- Headache: This is one of the most common side effects reported by users. It is usually mild and goes away on its own.
- Back pain and muscle aches: Some people may experience back pain and muscle aches, which can occur 12 to 24 hours after taking the medication. These side effects usually go away within 48 hours.
- Indigestion and stomach discomfort: Some individuals may experience indigestion, stomach discomfort, or acid reflux after taking Cialis. This side effect is usually temporary and can be relieved by taking the medication with food.
- Flushing: Cialis can cause a warm sensation or redness in the face, neck, or chest. This is known as flushing and usually goes away after a few hours.
- Nasal congestion: Some users may experience a stuffy or runny nose after taking Cialis. This side effect is generally mild and temporary.
What is the cost of cialis generic online?
The price of generic Cialis can range from as low as $0.70 per pill to around $2.50 per pill, depending on the dosage and quantity you purchase. Online pharmacies often provide discounts and coupons that can help you save even more on your purchase.
How long does it take for generic cialis to start working?
Generally, sialis starts to take effect within 30 minutes to an hour after ingestion. However, the onset of action time may be faster or slower in some people. It is important to follow the recommended dosing instructions provided by your doctor or listed on the package.
In addition, the presence of food in the stomach may affect the time it takes for Cialis to take effect. Taking Cialis with fatty foods may delay the onset of its action. It is recommended to take Cialis on an empty stomach or with a light meal to ensure optimal absorption and effectiveness.
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