How should I take Cialis?

Cialis® should be taken at least 30–60 minutes before sex. Cialis is a long acting drug and will stay active in your body for up to 36 hours, which is sometimes why it’s nicknamed “the weekend pill.” Some people have better results when they take Cialis® at least 2 hours before sex. Cialis® absorption is not affected by food and can be taken with or without food.

1. Take at least 30–60 minutes before sex.

2. Some people have better results when they take Cialis® at least 2 hours before sex.

3. Cialis is a long acting drug and will stay active in your body for up to 36 hours.

4. Cialis® absorption is not affected by food and can be taken with or without food.

What should you know before taking Cialis

Contraindications

Who should not take Cialis® or generic Cialis®?

Do not take Cialis® or generic Cialis® if you:

• • • take medicines called nitrates (such as nitroglycerin)
    • use street drugs called “poppers” such as amyl nitrate or amyl nitrite, and butyl nitrate
    • take any medicines called guanylate cyclase stimulators such as riociguat (Adempas)
    • are allergic to Cialis® or any of the ingredients in Cialis®. See the end of this section for a complete list of ingredients in Cialis®.

What should I tell my healthcare provider before taking Cialis® or generic Cialis®?

To make sure Cialis® is safe for you, tell your healthcare provider if you have any of the following before you take Cialis® or generic Cialis®:

• • • Have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure
    • Have pulmonary hypertension
    • Have had a stroke
    • Have low blood pressure, or high blood pressure that is not controlled
    • Have a deformed penis shape
    • Have had an erection that lasted for more than 4 hours
    • Have problems with your blood cells such as sickle cell anemia, multiple myeloma, or leukemia
    • Have retinitis pigmentosa, a rare genetic (runs in families) eye disease
    • Have ever had severe vision loss, including an eye problem called NAION
    • Have bleeding problems
    • Have or have had stomach or intestinal ulcers
    • Have liver problems
    • Have kidney problems or are having kidney dialysis
    • Have any other medical conditions

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

Cialis® and generic Cialis® may affect the way other medicines work, and other medicines may affect the way Cialis® and generic Cialis® works, causing side effects.

Drug interactions

Tell your healthcare provider if you take any of the following because these drugs interact with Cialis® and generic Cialis®:

• • • Medicines called nitrates
    • Medicines called guanylate cyclase stimulators such as Adempas® (riociguat)
    • Medicines called alpha-blockers such as Hytrin® (terazosin HCl), Flomax® (tamsulosin HCl), Cardura® (doxazosin mesylate), Minipress® (prazosin HCl), Uroxatral® (alfuzosin HCl), Jalyn® (dutasteride and tamsulosin HCl), or Rapaflo® (silodosin). Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. In some patients, the use of VIAGRA® or generic VIAGRA® with alpha-blockers can lead to a drop in blood pressure or to fainting
    • Medicines called HIV protease inhibitors, such as ritonavir (Norvir®), indinavir sulfate (Crixivan®), saquinavir (Fortovase® or Invirase®), or atazanavir sulfate (Reyataz®)
    • Oral antifungal medicines, such as ketoconazole (Nizoral®) and itraconazole (Sporanox®)
    • Antibiotics, such as clarithromycin (Biaxin®), telithromycin (Ketek®), or erythromycin
    • Other medicines that treat high blood pressure
    • Other medicines or treatments for ED
    • Adcirca® (tadalafil) is used to treat a rare disease called pulmonary arterial hypertension (PAH) and has the same active ingredient as Cialis®. Cialis® and generic Cialis® should not be used with Adcirca® or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Revatio® [sildenafil citrate])

Ask your healthcare provider or pharmacist for a list of these medicines, if you are not sure.

Know the medicines you take. Keep a list of them to show to your healthcare provider and pharmacist when you get a new medicine.

Cialis® side effects

What are the possible side effects of Cialis® and generic Cialis®?

Cialis® and generic Cialis® can cause serious side effects. Rarely reported side effects include:

• an erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away. If it is not treated right away, priapism can permanently damage your penis.
• sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). It is uncertain whether PDE5 inhibitors directly cause the vision loss. Stop taking Cialis® and call your healthcare provider right away if you have sudden vision loss in one or both eyes.
• sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you have these symptoms, stop takingCialis® or generic Cialis® and contact a doctor right away.

The most common side effects of Viagra® and generic Cialis® are:

• headache
• flushing
• upset stomach
• abnormal vision, such as changes in color vision (such as having a blue color tinge) and blurred vision
• stuffy or runny nose
• muscle pain
• nausea
• dizziness
• rash

In addition, heart attack, stroke, irregular heartbeats and death have happened rarely in men taking Cialis® . Most, but not all, of these men had heart problems before taking Cialis® . It is not known if Cialis® caused these problems.