In another trial , people took 2. In some cases, medications for BPH, such as dutasteride Avodart , may cause a lower libido sex drive and result in ED. The studies used two different questionnaires, one for ED symptoms and one for BPH symptoms, to determine how well the medication worked. This means that, on average, people who took Cialis noticed a larger decrease in their BPH symptoms than people who took a placebo.
This means that people who took Cialis usually had greater erectile function than people who took a placebo. In addition to the uses listed above, Cialis may be used off-label for other purposes. Below is an example of an off-label use for Cialis. However, it may be used off-label for this purpose. The study showed that more people who took Cialis were able to pass their stones than people who took tamsulosin. Ureteral stones usually start out as kidney stones and then move into the ureter the tube that urine travels in from the kidney to the bladder.
Kidney stones are minerals that form a stone inside a kidney. Cialis may work to treat ureteral stones by relaxing the ureter muscles. This makes the ureter wider, which can help you pass the stones more easily. Cialis is available as a generic drug called tadalafil. A generic drug is an exact copy of the active drug in a brand-name medication.
The generic is considered to be as safe and effective as the original drug. Generics tend to cost less than brand-name drugs. In some cases, the brand-name drug and the generic version may come in different forms and strengths. Typically, your doctor will start you on a low dosage. Your doctor will ultimately prescribe the smallest dosage that provides the desired effect. If you have certain conditions, such as kidney or liver problems, your doctor may have you start with a low dose of Cialis.
The following information describes dosages that are commonly used or recommended. However, be sure to take the dosage your doctor prescribes for you.
Your doctor will determine the best dosage to fit your needs. For symptoms of benign prostatic hyperplasia , the recommended dosage of Cialis is 5 mg once a day. You should take the drug at about the same time each day. In some cases, your doctor may have you take 5 mg of Cialis a day along with finasteride Proscar to treat BPH.
If your doctor recommends that you take Cialis only as needed for ED, the usual dosage is 10 mg before sexual activity. They may reduce this to 5 mg if the medication is working too well.
This will increase the dose back to 10 mg. The maximum dose of Cialis that can be taken in a day is 20 mg. In clinical trials , Cialis helped people with ED symptoms for up to 36 hours after their dose.
And be sure to speak with them if you feel you need more of the drug, rather than increasing your dosage yourself. Cialis can also be taken once a day to treat ED. In this case, the dosage usually starts at 2. And if your doctor recommends using Cialis every day, you should take the drug at about the same time each day. You should try to take your dose at about the same time each day. This dose is too high and may cause serious side effects, such as decreased blood pressure.
If you forget to take your once-a-day dose of Cialis, take it as soon as you remember. However, never take two doses in 1 day. If you missed your dose yesterday, just skip the missed dose and continue with your once-a-day dosing. A medication timer may be useful, too. Cialis may also be used to treat ED long term.
But in some cases, your doctor may determine the cause of your ED, such as depression or an illness. In such instances, you may be able to stop taking Cialis after the cause of your ED has been treated. Cialis can cause mild or serious side effects. The following lists contain some of the key side effects that may occur while taking Cialis. For more information on the possible side effects of Cialis, talk with your doctor or pharmacist.
They can give you tips on how to deal with any side effects that may be bothersome. Most of these side effects may go away within a few days or a couple of weeks. Call your doctor right away if you have serious side effects. You may wonder how often certain side effects occur with this drug. As with most drugs, some people can have an allergic reaction after taking Cialis. The allergic reactions included a serious rash and skin conditions such as Stevens-Johnson syndrome a life threatening rash that causes painful blisters.
A more severe allergic reaction is rare but possible. Symptoms of a severe allergic reaction can include:. Call your doctor right away if you have a severe allergic reaction to Cialis. Headache is a common side effect that may occur with Cialis. In clinical trials , depending on the condition being treated:. If you have headaches that are bothersome to you while using Cialis, talk with your doctor. They may be able to recommend ways to help ease this side effect.
Changes in blood pressure are a possible side effect of taking Cialis. Low blood pressure occurs most often while taking this medication. But high blood pressure can occur as well. Clinical trials looked at blood pressure in people who took 20 mg of Cialis or a placebo. Blood pressure decreased by an average of 1. If you have these symptoms while taking Cialis, tell your doctor right away. Although rare, Cialis may also increase your blood pressure.
This was a side effect that was reported only in people who took Cialis once a day for erectile dysfunction ED. In this trial , depending on the condition being treated:. If you have any symptoms of high blood pressure, such as headaches or chest pain, tell your doctor right away. Back pain is a common side effect with Cialis. In clinical trials , depending on the condition being treated, back pain was reported in:. Back pain usually occurs between 12 and 24 hours after taking Cialis.
Usually, back pain goes away within 2 days of taking your dose. Heartburn is a common side effect of Cialis. In clinical trials , depending on the condition being treated, heartburn occurred in:. They may be able to recommend ways to treat this side effect. This side effect can lead to priapism , which is a painful erection lasting longer than 4 hours.
If you have an erection that lasts longer than 4 hours while using Cialis, see a doctor or go to the hospital right away. Very rarely, Cialis may cause a loss of vision in either one eye or both eyes.
While taking Cialis, if you have any changes in vision, such as decreased vision or loss of vision, tell your doctor right away. The best way to take Cialis is to use it exactly as your doctor directs, either once a day at the same time each day or only as needed. And you should never take Cialis more than once a day. If you have: benign prostatic enlargement — take it as soon as you remember and then continue as usual pulmonary hypertension — take it within 8 hours if you can.
If you remember after 8 hours, skip the missed dose and take the next dose as usual. Never take 2 doses at the same time. Never take an extra dose to make up for a forgotten one. If you often forget doses, it may help to set an alarm to remind you.
What if I take too much? Taking too much tadalafil by accident can cause unpleasant side effects, including: headache dizziness indigestion stuffy nose problems with your vision such as blurred vision Side effects will usually go away when you stop taking the tablets.
Common side effects Common side effects happen in more than 1 in people. If you get these side effects, keep taking the medicine, but tell a doctor or pharmacist if they bother you or do not go away: headaches feeling sick nausea red or flushed face indigestion stuffy nose muscle aches Serious side effects Serious side effects are rare and happen in less than 1 in 1, people.
Stop taking tadalafil and call a doctor straight away if you get: chest pains — if this happens during or after sex, get into a semi-sitting position and try to relax remember do not use nitrates for chest pain while taking tadalafil prolonged and sometimes painful erections — if you have an erection that lasts for more than 4 hours, contact a doctor immediately a sudden problem with your eyesight or hearing a serious skin reaction — symptoms may include red raised patches on your skin or red spots hives , a swollen face and swelling around the eyes seizures or fits Serious allergic reaction In rare cases, tadalafil can cause a serious allergic reaction anaphylaxis.
Information: You can report any suspected side effect using the Yellow Card safety scheme. Visit Yellow Card for further information.
Women with pulmonary hypertension may be treated with tadalfil. Non-urgent advice: Tell your doctor if you're:. Some medicines do not mix well with tadalafil. Important Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.
How does tadalafil work? Tadalafil belongs to a group of medicines called phosphodiesterase 5 PDE5 inhibitors. How well does it work for erection problems?
Tadalafil works well for erectile dysfunction. In general, more than 6 in 10 men say they have harder erections after taking it. If tadalafil does not work for you, it may be because: you have not waited long enough after taking it before trying to have sex you have waited too long after taking it to have sex the dose is not high enough you're not sexually aroused enough.
How long does it take to work? Tadalafil usually starts to work within 30 to 60 minutes. It's triggered by sexual stimulation, so you need to be aroused for it to work. How long will it work for? Your erection should go away after you have had sex. Can I take it as often as I want? No — do not take tadalafil more than once a day. How does it compare with other medicines that improve erections?
Other medicines are usually taken on demand, 30 to 60 minutes before sexual activity. If tadalafil does not work, there are other tablets you could try that work in a similar way, such as: sildenafil Viagra avanafil Spedra vardenafil Levitra Only sildenafil Viagra is available without prescription. You can take tadalafil and vardenafil with or without food. Alprostadil comes as: an injection directly into your penis a small pellet placed inside your urethra the tube that carries pee from your bladder to the tip of your penis If you cannot get erections because of a hormonal problem, your doctor may refer you to an endocrinologist a doctor who specialises in the treatment of hormonal problems.
Are there other treatments that can help erections? Other treatments for erectile dysfunction include: a vacuum pump psychological treatments penile implants pelvic floor muscle exercises Some complementary therapies, such as acupuncture, have claimed to treat erectile dysfunction.
Are there any other medicines for an enlarged prostate? Other medicines prescribed are: 5-alpha reductase inhibitors, such as finasteride and dutasteride alpha-blockers, such as tamsulosin and alfuzosin. Are there any other medicines for pulmonary hypertension?
If tadalafil does not work, a doctor might recommend sildenafil, which works in a similar way. To learn about more treatments for erectile dysfunction, buy the Harvard Special Health Report Erectile Dysfunction: How medication, lifestyle changes, and other therapies can help you conquer this vexing problem. As a service to our readers, Harvard Health Publishing provides access to our library of archived content.
Please note the date of last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.
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Get helpful tips and guidance for everything from fighting inflammation to finding the best diets for weight loss Stay on top of latest health news from Harvard Medical School. Recent Blog Articles. This allows an increase of blood flow into the penis.
An erection is the result of an increase in blood flow into certain internal areas of the penis. Cialis is different from other currently approved products for ED in that it stays in the body longer. However, there were no studies that directly compared the clinical efficacy and safety of Cialis to other products. Cialis is taken orally before sexual activity, not more than once daily. Cialis may be taken with or without food.
In some patients, the dose strength and maximum frequency of use may be adjusted. For more detailed information consult with your health care provider. The most commonly reported side effects in patients treated with Cialis during the testing of the product were: headache indigestion back pain muscle pain flushing stuffy nose Patients who get back pain and muscle aches usually get them 12 to 24 hours after taking Cialis and these usually go away by themselves within 48 hours.
CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication.
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