Powder Cialis (Tadalafil)

Description

Tadalafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, tadalafil works by increasing blood flow to the penis to help a man get and keep an erection. Tadalafil is also used to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH). It helps to relieve symptoms of BPH such as difficulty in beginning the flow of urine, weak stream, and the need to urinate often or urgently (including during the middle of the night). Tadalafil is thought to work by relaxing the smooth muscle in the prostate and bladder. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Practice "safe sex" such as using latex condoms.

Pharmacokinetics

In healthy subjects, tadalafil exposure (AUC) increased dose-proportionally over the dose range of 2.5 to 20 mg. Steady-state plasma concentrations are achieved within 5 days after once-daily dosing, and exposures are approximately 1.6-fold greater than those after a single dose. Mean tadalafil concentrations measured in an independent study in healthy male subjects after administration of a single oral dose of 20 mg and single and multiple daily doses of 5 mg.

· Absorb

Following a single oral dose, the maximum plasma concentration (Cmax) of tadalafil is achieved in 30 minutes to 6 hours (median, 2 hours). The absolute bioavailability of tadalafil following oral administration has not been determined.

The rate and extent of tadalafil absorption are not affected by food; therefore Cialis can be taken with food or alone.

· Distribute

The mean apparent volume of distribution after oral administration was approximately 63 L, indicating distribution of tadalafil into tissues. At therapeutic concentrations, 94% of tadalafil in plasma is protein bound.

Less than 0.0005% of the dose occurs in the semen of healthy subjects.

· Metabolism

Tadalafil is primarily metabolized by CYP3A4 to its catechol metabolite. Catechol metabolites undergo extensive methylation and glucuronidation to form methylcatechol and methylcatechol glucuronidate conjugates, respectively. The major circulating metabolite is methylcatechol glucuronide. Methylcatechol concentration is less than 10% of the glucuronide concentration.

In vitro data indicate that the metabolite is not expected to be pharmacologically active at the concentrations of the metabolite observed.

· Excretion

In healthy subjects, the mean oral clearance of tadalafil is 2.5 L/hr and the mean terminal half-life is 17.5 hours. Tadalafil is primarily excreted as a metabolite, primarily in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose).

· Geriatrics

Healthy male elderly subjects (65 years or older) had lower oral clearance of tadalafil, resulting in an exposure (AUC) 25% higher than in healthy subjects 19 to 45 years of age, without an effect on Cmax. There is no need to adjust dosage based solely on age. However, older adults should be considered more sensitive to the drug [see Use in Specific Populations].

· Diabetics

In diabetic men, a 10 mg dose of tadalafil resulted in an approximately 19% reduction in exposure (AUC) and a 5% reduction in Cmax compared to healthy subjects. No dosage adjustment is required.

· Patients with prostatic hyperplasia

No statistical differences in exposure (AUC and Cmax) were observed between older (70 to 85 years) and younger (≤60 years) subjects in patients with BPH after single and multiple doses of 20 mg of tadalafil Significant differences in learning. No dosage adjustment is required.

How does tadalafil work?

Tadalafil, commonly known by the brand name Cialis, is a medication primarily used to treat erectile dysfunction (ED), benign prostatic hyperplasia (BPH), and pulmonary arterial hypertension (PAH). It works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5), which regulates blood flow in the body.

Mechanism of Action:

PDE5 Inhibition: Tadalafil blocks the enzyme PDE5, which breaks down a molecule called cyclic guanosine monophosphate (cGMP). cGMP is responsible for relaxing smooth muscle tissue in blood vessels.

Increased Blood Flow: By preventing the breakdown of cGMP, tadalafil allows blood vessels in certain areas, such as the penis, to relax and widen. This improves blood flow to the penis, helping to achieve and maintain an erection during sexual stimulation.

Prolonged Effect: Tadalafil has a longer half-life compared to other ED medications, lasting up to 36 hours, which is why it's known as the "weekend pill."

For BPH and PAH: In treating BPH, tadalafil helps to relax muscles in the prostate and bladder, easing symptoms like frequent or difficult urination. For PAH, it relaxes blood vessels in the lungs, reducing blood pressure and improving exercise capacity.

Summary:

Tadalafil works by enhancing blood flow to specific areas of the body, particularly the penis, through PDE5 inhibition, helping men with ED. It also relaxes muscles in the prostate for BPH treatment and blood vessels in the lungs for PAH treatment.

How do I take tadalafil?

Tadalafil can be taken in different ways depending on the condition being treated. Here's how to use it for various purposes:

1. For Erectile Dysfunction (ED):

As Needed:

Dosage: Start with 10 mg, taken before sexual activity. Depending on how well it works and tolerance, the dose may be increased to 20 mg or decreased to 5 mg.

Timing: Take it 30 minutes to 1 hour before sexual activity.

Frequency: It can be taken once a day, but the effects can last up to 36 hours.

Daily Use:

Dosage: 2.5 mg to 5 mg once a day, taken at the same time each day, regardless of sexual activity.

Benefit: Allows for spontaneous sexual activity without needing to plan around the medication's timing.

2. For Benign Prostatic Hyperplasia (BPH):

Dosage: Typically 5 mg once daily, taken at the same time each day.

When to Take: It's best to take it at a consistent time daily, with or without food.

3. For Erectile Dysfunction and BPH Combined:

Dosage: 5 mg once daily, at the same time each day.

4. For Pulmonary Arterial Hypertension (PAH):

Dosage: The usual dose for PAH is 40 mg (two 20 mg tablets) taken once daily.

When to Take: Can be taken with or without food, and at the same time each day.

General Tips:

Do not take more than one dose per day for any condition.

Avoid alcohol or limit it, as it may reduce the effectiveness of tadalafil and increase the risk of side effects such as dizziness.

Do not take with nitrates (for chest pain) or certain other medications without consulting your doctor, as it can cause a dangerous drop in blood pressure.

You can take tadalafil with or without food, but a high-fat meal might slightly delay its effects.

Always follow the dosage instructions provided by your healthcare provider, as they may adjust your dose based on your individual response and tolerance.

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