Tadalafil and Sildenafil Taken Together

Tadalafil and sildenafil are both PDE5 inhibitors used for the treatment of erectile dysfunction (ED). Although they work through a similar mechanism—by increasing blood flow to the penis—they are different medications with different durations of action.

• Sildenafil (the active ingredient in Viagra) usually starts working within 30 to 60 minutes and its effects typically last about 4 to 6 hours.

• Tadalafil (the active ingredient in Cialis) can begin working within 30 minutes, and its effects may last up to 36 hours.

Because they belong to the same class of medications, taking tadalafil and sildenafil together is generally not recommended unless specifically advised and monitored by a healthcare professional.

What Happens When Tadalafil and Sildenafil Are Taken Together?

Potential Risks of Combining Both Medications

1. Increased Side Effects

When used individually, both medications may cause side effects such as:

• Headache

• Facial flushing

• Nasal congestion

• Indigestion

Taking them together may intensify these effects and may increase the risk of:

• Low blood pressure (hypotension)

• Dizziness or fainting

• Abnormal heart rhythm

2. Cardiovascular Risks

Both tadalafil and sildenafil can interact dangerously with nitrate medications (such as nitroglycerin), potentially causing a sudden and severe drop in blood pressure.

Using both PDE5 inhibitors together may further increase cardiovascular risks, especially for men with underlying heart disease.

Why Do Some People Combine These Two Medications?

Some men with difficult-to-treat erectile dysfunction may ask about combining tadalafil and sildenafil because they hope to achieve:

• Stronger erections

• Longer-lasting effects

• Better results when a single medication does not provide sufficient improvement

However, combining medications does not always improve effectiveness and may increase the chance of adverse effects.

Differences Between Sildenafil and Tadalafil

Cialis (tadalafil) and Viagra (sildenafil) are both PDE5 inhibitors used to treat erectile dysfunction. Their main differences involve duration of action, food effects, and side-effect profiles.

How Long Do They Last?

Sildenafil

• Considered a short-acting ED medication

• Usually begins working 30–60 minutes after taking

• Effects typically last 4–6 hours

• Better suited for planned sexual activity

Tadalafil

• Considered a longer-acting ED medication

• Usually starts working within 30 minutes to 2 hours

• Effects can last up to 36 hours

• Often called the “weekend pill” because it provides a longer window of effectiveness

Does Food Affect Absorption?

Sildenafil

• Absorption can be affected by high-fat meals

• Taking it after a heavy or fatty meal may delay its onset

• It is often recommended to take sildenafil on an empty stomach or after a light meal

Tadalafil

• Absorption is generally not significantly affected by food

• It can be taken with or without meals

• It has fewer dietary restrictions

Can Tadalafil and Sildenafil Be Taken on the Same Day?

In most cases, you should avoid taking tadalafil and sildenafil on the same day unless a doctor specifically recommends it.

A safer approach is usually:

• Use only one PDE5 inhibitor at a time

• Follow the recommended dosage instructions

• If the treatment is not effective, discuss adjustments with a healthcare provider

Important Safety Warnings

Do not combine tadalafil or sildenafil with:

• Nitrate medications (such as nitroglycerin used for chest pain)

• Certain recreational drugs containing nitrates, such as “Poppers” (amyl nitrite)

• Excessive alcohol consumption

Men with:

• Certain heart conditions

• Poorly controlled high or low blood pressure

• Severe liver or kidney disease

• Use of certain prescription medications

should consult a healthcare professional before using ED medications.

Alternatives When One ED Medication Does Not Work

If sildenafil or tadalafil alone does not provide satisfactory results, doctors may consider:

• Adjusting the dosage

• Trying another ED medication, such as vardenafil

• Treating underlying causes, including:

• Stress or anxiety

• Diabetes

• Cardiovascular problems

• Low testosterone levels

• Medication-related side effects

• Using a combination of ED treatment approaches under medical supervision