Evaluation of the efficacy and safety of once-a-day dosing of tadalafil 5mg and 10mg in the treatment of erectile dysfunction: results of a multicenter, randomized, double-blind, placebo-controlled trial

An interaction between two medications does not always mean that you must stop taking one of the medications; however, sometimes it does. Speak to your doctor about how drug interactions should be managed.

1.4 Limitation of Use

The best way to make informed decisions is by consulting with a men’s health urologist who can tailor a plan to your specific needs. Modern urology has never been as advanced as it is today, with new procedures and options for virtually every man. Contact us and schedule an appointment to learn more. Medically reviewed by Carmen Pope, Senior Medical Editor, B. Pharm.

Efficacy and treatment satisfaction with on-demand tadalafil (Cialis) in men with erectile dysfunction

Tadalafil is used to treat erectile dysfunction (ED) and/or symptoms of benign prostatic hypertrophy (BPH). Tadalafil works by blocking the action of an enzyme known as cGMP-specific phosphodiesterase type-5 (PDE-5). This enzyme breaks down cGMP, a substance that induces smooth muscles to relax. Blocking PDE-5 means increased levels of cGMP within the smooth muscles which promotes muscle relaxation and vasodilation (a widening of blood vessels). High levels of PDE-5 are found in the penis, lungs, and retina. In addition, taking tadalafil with too much alcohol can lead to orthostatic hypotension, which is a drop in blood pressure when you go from a sitting or lying down position to standing. Symptoms include a headache, dizziness, or fainting when standing.

Product	Dosage	Quantity + Bonus	Price
Tadalista Super Active	20mg	30 + 6 Pills	128.09€ 121.99€	Buy
Cialis Generic	10mg	90 + 6 Pills	146.17€ 139.21€	Buy
Cialis Generic	10mg	60 + 6 Pills	105.81€ 100.77€	Buy
Cialis Generic	20mg	180 + 10 Pills	254.09€ 241.99€	Buy
Cialis Generic	5mg	120 + 6 Pills	132.92€ 126.59€	Buy
Cialis Generic	20mg	360 + 10 Pills	427.34€ 406.99€	Buy
Cialis Generic	60mg	10 Pills	41.22€ 39.26€	Buy
Cialis Generic	2.5mg	120 + 6 Pills	128.93€ 122.79€	Buy
Cialis Generic	5mg	20 Pills	41.99€ 39.99€	Buy
Cialis Generic	5mg	360 + 10 Pills	268.08€ 255.31€	Buy
Cialis Generic	10mg	120 + 6 Pills	178.49€ 169.99€	Buy
Cialis Generic	5mg	10 Pills	29.39€ 27.99€	Buy
Cialis Generic	60mg	90 + 6 Pills	196.67€ 187.30€	Buy
Cialis Generic	60mg	360 + 10 Pills	570.52€ 543.35€	Buy
Cialis Generic	60mg	120 + 8 Pills	240.18€ 228.74€	Buy

Antacids, such as magnesium hydroxide or aluminum hydroxide may also affect the absorption of tadalafil.

• Cost-saving tip: ask for a 90-day supply if on daily therapy.
• Some insurance plans have tiered formularies affecting copay.
• Manufacturer of Cialis (Eli Lilly) may offer savings programs.
• International nonproprietary name (INN) is tadalafil.
• Patent expirations allowed for generic market entry.
• Always verify pharmacy accreditation before purchasing online.

Grapefruit juice may also increase the side effects of tadalafil.

Storage Condition	Temperature Range	Light Exposure	Shelf Life	Additional Notes
Room Temperature	20-25°C	Keep in original container	2-3 years	Keep away from moisture and heat
Protect from Light	Yes	Yes		Store in a cool, dry place
Keep Out of Reach of Children	Yes			Essential safety measure

Note that this list is not all-inclusive and includes only common medications that may interact with tadalafil. You should refer to the prescribing information for tadalafil for a complete list of interactions.

How should this medicine be used?

Common side effects include headache, flushing, and dyspepsia. Dose adjustment needed in kidney or liver disease. Once-daily tadalafil can be taken without regard to sexual activity but should be taken at the same time every day (for example, on awakening). Tadalafil may be taken with or without food. If you are prescribed the chewable tadalafil Chewtadzy, chew the tablet completely before swallowing.

Product Details

Chewtadzy may be taken with or without food or with or without water. Drinking alcohol after taking tadalafil may lower blood pressure and decrease sexual performance. Eating grapefruit or grapefruit products while taking tadalafil is not recommended. Always talk to your doctor before taking ANY medication for ED. Some ED medications are not suitable for men with certain medical conditions. Tadalafil (Erectile Dysfunction, Benign Prostatic Hyperplasia) monograph Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use tadalafil only for the indication prescribed.

• For BPH, it relaxes smooth muscle in the prostate and bladder.
• Can be prescribed with other BPH medications like finasteride.
• May reduce the need for BPH-related surgery.
• Monitor for signs of allergic reaction: hives, swelling, difficulty breathing.
• In case of overdose, seek immediate medical attention.
• Overdose symptoms may include severe headache, vomiting.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Parameter	Value	Description
Absorption Rate	Rapid	Peaks in about 2 hours
Bioavailability	80%	Percentage absorbed into bloodstream
Half-life	17.5 hours	How long the drug stays active
Metabolism	Liver via CYP3A4	Hepatic processing
Excretion	Feces and urine	Mainly via feces

Tadalafil is a reversible phosphodiesterase type 5 (PDE5) inhibitor approved for the treatment of erectile dysfunction (ED). As a class, PDE5 inhibitors (including sildenafil [Viagra] and vardenafil [Levitra]), enhance erectile response to sexual stimulation by increasing penile blood flow.

8.6 Hepatic Impairment

The recommended starting dose for the "as needed" tadalafil tablet is 10mg taken before sexual activity and the effects of one tablet lasts for up to 36 hours. May be taken with or without food. There is a chewable formulation of tadalafil called Chewtadzy, available as 5 mg, 10 mg, and 20 mg chewable tablets. Tadalafil is a generic, which means it is sold at a lower price compared to branded versions of tadalafil (such as Cialis). If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include: A headache, dyspepsia, back pain, nasal congestion, and flushing are the most commonly reported side effects.

How does Cialis work?

Other side effects include a drop in blood pressure, muscle or limb pain, or conjunctivitis. Rarely, may decrease blood flow to the optic nerve causing sudden vision loss. The risk is greater in people aged older than 50, with diabetes, heart disease, high blood pressure, high cholesterol, who smoke, or with certain pre-existing eye problems. Rarely, may cause other side effects including hearing loss, or lead to painful erections lasting longer than four to six hours. See your doctor immediately if this happens. In general, few side effects occur with tadala-fil unless it is taken in conjunction with other drugs.

Country	Average Cost per Tablet	Brand Options	Over-the-counter Availability	Notes
USA	$10 - $20	Cialis, generics	No	Prescription needed
UK	£8 - £15	Cialis, generics	No	Prescription required
India	₹50 - ₹150	Tadalafil generics	Yes in some pharmacies	Lower cost, widely available
Australia	AU$20 - AU$35	Cialis, generics	No	Prescription necessary
Canada	CAD 15 - CAD 25	Cialis, generics	No	As per healthcare regulations

When combined with α1-adrenergic blockers such as doxazosin (Cardura), prazosin (Minipress), and terazosin (Hytrin) but not tamsulosin (Flomax)—tadalafil can cause a significant drop in blood pressure.

ED is Treatable in Nearly Every Man

PDE-5 is also found throughout the body within the smooth muscle cells of blood vessels and muscles. Tadalafil belongs to the drug class called PDE-5 inhibitors. Tadalafil is used for the treatment of erectile dysfunction (ED). It increases blood flow to the penis following sexual stimulation and allows men to keep an erection hard enough for sex. Tadalafil is also used to treat the signs and symptoms of benign prostatic hyperplasia (BPH).

What are the most common side effects of tadalafil?

It can also be used to treat people with ED who have signs and symptoms of BPH. Tadalafil is available as a lower-strength tablet that can be taken daily, eliminating the need to 'plan' for sex, and a higher-strength "as needed" tablet. The recommended starting dose for tadalafil intended for once-daily use for sexual activity is 2.5mg, taken at the same time each day, without regard to the timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. When used to treat BPH, tadalafil should be started at 5mg daily. Similarly, concomitant use of nitrates (including recreational nitrates known as “poppers”) with tadalafil also is contraindicated.

Publication types

Call your doctor immediately if you experience dizziness, feel nauseous during sexual activity, or develop pain, numbness, or tingling in your chest, arms, neck, or jaw. Do not take tadalafil if you are also taking a nitrate drug (such as nitroglycerin or isosorbide dinitrate/mononitrate) for chest pain or heart problems. Do not take tadalafil with recreational drugs such as "poppers". Taking these substances together can cause a sudden and dangerous drop in blood pressure. Always buy your ED medications from a reputable supplier as there are a lot of counterfeit products in circulation.

cGMP-dependent protein kinases and cGMP phosphodiesterases in nitric oxide and cGMP action

Certain lifestyle and psychological factors, such as smoking, drinking, and stress, can exacerbate ED. Eliminating these - for example, staying more active, losing weight if you are overweight, reducing alcohol intake, stopping smoking, and reducing stress - may also help improve ED. Taking tadalafil does not protect you from sexually transmitted diseases. Consider condom risk or abstinence if a sexual partner's history is unknown. Seek urgent medical advice if an allergic reaction, sudden vision loss, or painful erections lasting more than four hours occur. For life-threatening situations, nitrates may be considered if at least 48 hours have passed since the last dose of tadalafil and if close hemodynamic monitoring is available.

2.3 Tadalafil Tablets for Once Daily Use for Benign Prostatic Hyperplasia

Peak plasma concentrations of tadalafil are reached within 30 minutes to six hours (average time two hours) of a dose. Effects of 'as needed' tadalafil last for up to 36 hours. The recommended starting dose for once-daily tadalafil for ED is 2.5mg; once-daily tadalafil for BPH: 5mg; and 'as needed' tadalafil: 10mg. The dosage may be adjusted based on individual response. Medicines that interact with tadalafil may either decrease its effect, affect how long it works, increase side effects, or have less of an effect when taken with tadalafil. Tadalafil will lower blood pressure an additional 4 to 10 mm Hg when used with antihypertensive drugs. Dosage should be limited to 10 mg within a 72-hour period when patients are also taking drugs such as erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox), protease inhibitors, and other drugs that inhibit the CYP3A4 enzyme system.1 Patients with cardiovascular diseases have been excluded from studies of tadalafil because so little is known about its safety profile in this population.1 The current recommendation for patients who experience coital angina after taking a PDE5 inhibitor is to contact emergency services that provide transport to a hospital.2 Rare reports of priapism have been reported with all of the drugs in this class.1 Long-term safety has not been established.

What should I know about storage and disposal of this medication?

May not be suitable for some people including those with angina, chest pain, other heart conditions, liver or kidney problems, blood or bleeding disorders, stomach ulcers, certain eye conditions, or a physical deformity of the penis (such as Peyronie's disease). May interact with some medications including nitrates - the use of tadalafil and nitrates is contraindicated because of the severe hypotension that can develop. May also interact with other medications including ketoconazole or ritonavir; dosage adjustment is recommended. The dosage of tadalafil may need to be reduced in men with kidney disease. Once-daily use may not be recommended in men with severe kidney disease.

J Urol

Only use for 26 weeks when given with finasteride to initiate BPH treatment, because the benefit of Tadalafil tablets decreases from 4 weeks until 26 weeks, and benefits beyond 26 weeks are unknown A lower dosage of tadalafil is recommended in men with mild-to-moderate liver disease. Tadalafil should be avoided with severe liver disease. Note: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. Tadalafil is a PDE-5 inhibitor that increases blood flow by relaxing smooth muscle, and is used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in men. Available as a daily low-dose tablet (2.5–5 mg) or an buy tadalafil "as-needed" 10 mg tablet lasting up to 36 hours; a chewable formulation also exists.