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Most important fact about Cialis

Cialis causes erections only during sexual excitement. It does not work in the absence of arousal and does not increase sexual desire.

How should you take Cialis?

Take one Cialis tablet before sexual activity, with or without food. The best time to take Cialis depends on how and when the drug works for you, but some men are able to have an erection 30 minutes after taking it. Others are able to wait up to 36 hours after taking Cialis before engaging in sexual activity.
- If you miss a dose.
Take Cialis only before sexual activity, but no more than once a day. Do not take two doses at once.
- Storage instructions.
Store at room temperature.

What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe to continue using Cialis.
More common side effects may include:
Arm and leg pain, back pain, flushing, headache, indigestion, muscle aches, nasal congestion.
This side effects list is not complete. If you have any questions about side effects you should consult your doctor. Report any new or continuing symptoms to your doctor right away.

Why should Cialis not be prescribed?

Do not take Cialis if you are taking any nitrate-based drug, including nitroglycerin patches (Nitro-Dur, Transderm-Nitro), nitroglycerin ointment (Nitro-Bid, Nitrol), nitroglycerin pills (Nitro-Bid, Nitrostat), and isosorbide pills (Dilatrate-SR, Isordil, Sorbitrate). This also includes street drugs known as "poppers," including amyl nitrate and butyl nitrate. Combining Cialis with any of these drugs can cause a dangerous drop in blood pressure.
Likewise, do not take Cialis with certain blood pressure and prostate drugs known as alpha-blockers, including Cardura (doxazosin), Hytrin (terazosin), Minipress (prazosin), and Uroxatral (alfuzosin). However, you can take the alpha-blocker Flomax (tamsulosin) at a dose of 0.4 milligrams once a day.
If Cialis gives you an allergic reaction, do not use it again.

Recommended dosage

Adult males.
Doses range from 5 milligrams to 20 milligrams, depending on the drug's effect. The recommended starting dose is 10 milligrams.
Take Cialis only before sexual activity. The manufacturer recommends a maximum of one dose per day. If you're taking certain drugs that affect the liver, such as ritonavir (Norvir) or ketoconazole (Nizoral), the maximum recommended dose is 10 milligrams no more than once every 3 days.
If you have moderate kidney impairment, the recommended starting dose is 5 milligrams once a day, up to a maximum of 10 milligrams once every 2 days. If you have severe kidney impairment or need dialysis, the maximum recommended dose is 5 milligrams once a day. No dosage adjustment is required if you have mild kidney problems.
If you have mild or moderate liver impairment, your total daily dose should not exceed 10 milligrams once a day. If your liver is severely impaired, you will not be able to use Cialis.