Description
Cialis 20mg is an as-needed strength for erectile dysfunction. According to the current U.S. prescribing information, tadalafil for ED is generally started at 10mg when used as needed and may be increased to 20mg or reduced to 5mg depending on effectiveness and tolerability. It should not be taken more than once in a 24-hour period unless specifically directed otherwise by a healthcare professional.
Read the official Cialis prescribing information on DailyMed
How Cialis 20mg Works
Tadalafil belongs to the PDE5 inhibitor class. During sexual stimulation, it helps increase blood flow to the penis by supporting the natural mechanisms involved in achieving an erection.
Importantly, sexual stimulation is still required. Cialis doesn’t automatically cause an erection simply because the tablet has been taken.
One distinctive characteristic of tadalafil is its relatively long duration. The official prescribing information states that Cialis used as needed can improve erectile function for up to 36 hours after a dose.
How Cialis 20mg Is Taken
Cialis may be taken with or without food. For ED, the 20mg strength is used as an as-needed dose when prescribed by a healthcare professional. The prescribing information states that Cialis should not be taken more than once per day for as-needed ED treatment.
The appropriate dose depends on factors such as effectiveness, tolerability, other medications, kidney or liver function, and overall health. Therefore, 20mg isn’t automatically the appropriate dose for every person with ED.
MedlinePlus: Tadalafil Medication Information
Common Side Effects
Some people taking tadalafil may experience:
- Headache
- Indigestion or heartburn
- Flushing
- Nasal or respiratory congestion
- Back pain
- Muscle or limb pain
- Diarrhea
- Dizziness
These effects may be temporary, but persistent or bothersome symptoms should be discussed with a healthcare professional.
Important Cialis 20mg Safety Information
Cialis should not be taken with nitrate medicines, such as nitroglycerin or isosorbide medicines, because the combination can cause a dangerous drop in blood pressure. The current Cialis prescribing information lists concurrent use with organic nitrates as a contraindication.
Patients should also tell their healthcare professional about alpha-blockers, blood-pressure medicines, other ED treatments, and all prescription or nonprescription medicines and supplements they use.
Large amounts of alcohol can increase the likelihood of dizziness, headache, rapid heartbeat, and low blood pressure while taking tadalafil.
When to Seek Medical Attention
Some reactions require prompt medical evaluation. Seek emergency medical attention for an erection lasting more than four hours, sudden vision loss, sudden hearing loss, severe allergic reactions, or chest pain or other serious symptoms during sexual activity.
If chest pain occurs during sexual activity, stop and seek medical attention rather than taking nitrate medication on your own, because tadalafil can remain in the body and interact dangerously with nitrates.
FDA Medication Safety Information
Cialis 20mg and Erectile Dysfunction
Erectile dysfunction can have many causes, including cardiovascular disease, diabetes, hormonal problems, neurological conditions, psychological factors, and medication effects.
Because ED can sometimes be associated with underlying health conditions, persistent erectile difficulties deserve appropriate medical evaluation rather than relying exclusively on self-treatment.
Cialis addresses the erectile-function component of ED; it doesn’t cure every underlying cause of erectile difficulties.
Cialis 20mg vs. Daily Tadalafil
It’s important not to confuse 20mg as-needed tadalafil with daily tadalafil therapy.
The current Cialis prescribing information lists 2.5mg as the recommended starting daily dose for ED, with an increase to 5mg when appropriate. For as-needed ED treatment, the usual starting dose is 10mg, which may be increased to 20mg or decreased to 5mg based on effectiveness and tolerability.
Therefore, Cialis 20mg shouldn’t be treated as a routine daily dose unless specifically prescribed that way by a healthcare professional.
Frequently Asked Questions
How long can Cialis 20mg work?
Tadalafil can improve erectile function for up to 36 hours after an as-needed dose, although individual experiences vary.
Does Cialis 20mg increase sexual desire?
No. Tadalafil helps improve blood flow needed for an erection during sexual stimulation; it doesn’t directly increase sexual desire.
Can Cialis be taken with food?
Yes. Cialis can be taken with or without food.
Can Cialis be taken with nitrates?
No. Cialis is contraindicated with organic nitrate medicines because the combination can cause a dangerous decrease in blood pressure.
Is Cialis 20mg appropriate for everyone?
No. The appropriate tadalafil dose depends on individual medical circumstances, medications, and tolerability. A healthcare professional should determine whether 20mg is suitable.

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