Mean tadalafil concentrations measured after the administration of a single oral dose of 20 mg and single and once daily multiple doses of 5 mg, from a separate study, (see Figure 4) to healthy male subjects are depicted in Figure 4.
- Men with spinal cord injuries may benefit from PDE5 inhibitors like Cialis.
- Efficacy can be lower in this population but is still significant for many.
- Men with prostatectomy for prostate cancer often experience ED.
- Cialis can be part of a penile rehabilitation program post-surgery.
- Such programs aim to preserve erectile tissue health during recovery.
- Use after prostatectomy should be carefully timed and monitored by a urologist.
- Other treatments like vacuum devices or injections may be combined.
- A multidisciplinary approach often yields the best long-term results.
- Never initiate such a regimen without specialist supervision.
Figure 4: Plasma tadalafil concentrations (mean ± SD) following a single 20-mg tadalafil dose and single and once daily multiple doses of 5 mg Absorption — After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 30 minutes and 6 hours (median time of 2 hours). Absolute bioavailability of tadalafil following oral dosing has not been determined.
| Region | Average Price per Pack | Prescription Required | Available Over-the-counter |
|---|---|---|---|
| USA | $60 - $80 per pack | Yes | No |
| UK | £45 - £60 per pack | Yes | No |
| India | ₹1500 - ₹2500 per pack | Yes | No |
The rate and extent of absorption of tadalafil are not influenced by food; thus CIALIS may be taken with or without food. Distribution — The mean apparent volume of distribution following oral administration is approximately 63 L, indicating that tadalafil is distributed into tissues.
| Study Name | Participants | Improvement in Erectile Function (%) | Duration of Effect | Satisfaction Rate |
|---|---|---|---|---|
| Study A | 200 | 85% | Up to 36 hours | 78% |
| Study B | 150 | 88% | 24-36 hours | 80% |
| Study C | 180 | 83% | 24 hours | 75% |
At therapeutic concentrations, 94% of tadalafil in plasma is bound to proteins.
| Condition | Reason | Precaution Notes |
|---|---|---|
| Use with Nitrates | Risk of severe hypotension | Do not combine with nitrate meds |
| Severe liver impairment | Reduced drug clearance | Consult healthcare provider |
| Allergic reaction to tadalafil | Possible hypersensitivity | Discontinue if reactions occur |
Less than 0.0005% of the administered dose appeared in the semen of healthy subjects.
- Cialis 20mg has been shown to be effective in clinical trials.
- Be aware of potential side effects like dizziness or rash.
- Always consult your doctor if you experience serious side effects.
- Cialis 20mg is part of a class called phosphodiesterase inhibitors.
- Avoid grapefruit juice while taking Cialis 20mg to prevent interactions.
- Cialis 20mg is not a cure for ED but helps manage symptoms temporarily.
- Do not use Cialis 20mg if you are taking medications for heart problems.
- Regular sexual activity with Cialis 20mg can help improve erectile function.
- Patients are advised to report any unusual symptoms promptly.
- Always follow your healthcare provider’s guidelines for safe use.
Metabolism — Tadalafil is predominantly metabolized by CYP3A4 to a catechol metabolite.
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Enalapril — A study was conducted to assess chep cialis the interaction of enalapril (10 to 20 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure due to tadalafil 10 mg in subjects taking enalapril was 4/1 mm Hg, compared to placebo. Metoprolol — A study was conducted to assess the interaction of sustained-release metoprolol (25 to 200 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure due to tadalafil 10 mg in subjects taking metoprolol was 5/3 mm Hg, compared to placebo. Effects on Blood Pressure When Administered with Alcohol Alcohol and PDE5 inhibitors, including tadalafil, are mild systemic vasodilators.
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When tadalafil 20 mg was administered with a lower dose of alcohol (0.6 g/kg, which is equivalent to approximately 4 ounces of 80-proof vodka, administered in less than 10 minutes), orthostatic hypotension was not observed, dizziness occurred with similar frequency to alcohol alone, and the hypotensive effects of alcohol were not potentiated. The effects of tadalafil on cardiac function, hemodynamics, and exercise tolerance were investigated in a single clinical pharmacology study. Of note, in this study, in some subjects who received tadalafil followed by sublingual nitroglycerin in the post-exercise period, clinically significant reductions in blood pressure were observed, consistent with the augmentation by tadalafil of the blood-pressure-lowering effects of nitrates. Single oral doses of phosphodiesterase inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels. Across all clinical studies with CIALIS, reports of changes in color vision were rare (<0.1% of patients). In vitro data suggests that metabolites are not expected to be pharmacologically active at observed metabolite concentrations. Elimination — The mean oral clearance for tadalafil is 2.5 L/hr and the mean terminal half-life is 17.5 hours in healthy subjects.
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Cialis Professional | 40mg | 270 + 6 Pills | 898.37€ 855.59€ | |
| Cialis Generic | 40mg | 270 + 10 Pills | 382.19€ 363.99€ | |
| Cialis Black | 80mg | 20 Pills | 71.83€ 68.41€ | |
| Cialis Generic | 10mg | 180 + 8 Pills | 236.88€ 225.60€ | |
| Cialis Black | 80mg | 60 + 4 Pills | 150.98€ 143.79€ | |
| Cialis Generic | 5mg | 180 + 10 Pills | 159.65€ 152.05€ | |
| Cialis Soft Tabs | 20mg | 10 Pills | 39.03€ 37.17€ | |
| Cialis Generic | 60mg | 120 + 8 Pills | 240.18€ 228.74€ | |
| Cialis Original | 20mg | 76 + 4 Pills | 319.19€ 303.99€ | |
| Cialis Original | 20mg | 14 + 2 Pills | 95.75€ 91.19€ | |
| Cialis Generic | 10mg | 60 + 6 Pills | 105.81€ 100.77€ | |
| Cialis Generic | 20mg | 360 + 10 Pills | 427.34€ 406.99€ | |
| Cialis Generic | 10mg | 360 + 10 Pills | 388.49€ 369.99€ |
Tadalafil is excreted predominantly as metabolites, mainly in the feces (approximately 61% of the dose) and to a lesser extent in the urine (approximately 36% of the dose). Geriatric — Healthy male elderly subjects (65 years or over) had a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on Cmax relative to that observed in healthy subjects 19 to 45 years of age.
8.6 Hepatic Impairment
Blood pressure was measured manually pre-dose at two time points (-30 and -15 minutes) and then at 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, and 24 hours post dose on the first, sixth and seventh days of tamsulosin administration. Alfuzosin — A single oral dose of tadalafil 20 mg or placebo was administered in a 2-period, crossover design to healthy subjects taking once-daily alfuzosin HCl 10 mg extended-release tablets, an alpha[1]-adrenergic blocker (N=17 completed subjects). Tadalafil or placebo was administered 4 hours after alfuzosin following a minimum of seven days of alfuzosin dosing. Blood pressure was measured manually at 1, 2, 3, 4, 6, 8, 10, 20, and 24 hours after tadalafil or placebo dosing. Effects on Blood Pressure When Administered with Antihypertensives Amlodipine — A study was conducted to assess the interaction of amlodipine (5 mg daily) and tadalafil 10 mg.
What is tadalafil used for?
In a similar study using tadalafil 20 mg, there were no clinically significant differences between tadalafil and placebo in subjects taking amlodipine. Angiotensin II receptor blockers (with and without other antihypertensives) — A study was conducted to assess the interaction of angiotensin II receptor blockers and tadalafil 20 mg. Following dosing, ambulatory measurements of blood pressure revealed differences between tadalafil and placebo of 8/4 mm Hg in systolic/diastolic blood pressure. Bendrofluazide — A study was conducted to assess the interaction of bendrofluazide (2.5 mg daily) and tadalafil 10 mg. Following dosing, the mean reduction in supine systolic/diastolic blood pressure due to tadalafil 10 mg in subjects taking bendrofluazide was 6/4 mm Hg, compared to placebo. However, greater sensitivity to medications in some older individuals should be considered [see Use in Specific Populations (8.5)].
5.3 Prolonged Erection
Of the 24 subjects in part C, 16 subjects were categorized as outliers following administration of tadalafil and 6 subjects were categorized as outliers following placebo during the 24-hour period after 8 a.m. dosing of tadalafil or placebo. Of these, 5 and 2 were outliers due to systolic BP <85 mm Hg, while 15 and 4 were outliers due to a decrease from baseline in systolic BP of >30 mm Hg following tadalafil and placebo, respectively. During the 24-hour period after 8 p.m. dosing, 17 subjects were categorized as outliers following administration of tadalafil and 7 subjects following placebo.
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Of these, 10 and 2 subjects were outliers due to systolic BP <85 mm Hg, while 15 and 5 subjects were outliers due to a decrease from baseline in systolic BP of >30 mm Hg, following tadalafil and placebo, respectively. Some additional subjects in both the tadalafil and placebo groups were categorized as outliers in the period beyond 24 hours. In the period prior to tadalafil dosing, one severe event (dizziness) was reported in a subject during the doxazosin run-in phase. In the third doxazosin study, healthy subjects (N=45 treated; 37 completed) received 28 days of once per day dosing of tadalafil 5 mg or placebo in a two-period crossover design. The results are shown in Table 6. Pediatric — Tadalafil has not been evaluated in individuals less than 18 years old [see Use in Specific Populations (8.4)]. 13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of FertilityTadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day.
2.1 Erectile Dysfunction
Three studies were conducted in men to assess the potential effect on sperm characteristics of tadalafil 10 mg (one 6 month study) and 20 mg (one 6 month and one 9 month study) administered daily. In addition there was no adverse effect on mean concentrations of reproductive hormones, testosterone, luteinizing hormone or follicle stimulating hormone with either 10 or 20 mg of tadalafil compared to placebo. The effect of a single 100-mg dose of tadalafil on the QT interval was evaluated at the time of peak tadalafil concentration in a randomized, double-blinded, placebo, and active (intravenous ibutilide) -controlled crossover study in 90 healthy males aged 18 to 53 years. In this study, the mean increase in heart rate associated with a 100-mg dose of tadalafil compared to placebo was 3.1 beats per minute. Over a dose range of 2.5 to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 10-fold for mice, and 14- and 26-fold for male and female rats, respectively, the exposures in human males given Maximum Recommended Human Dose (MRHD) of 20 mg.Tadalafil was not mutagenic in the in vitro bacterial Ames assays or the forward mutation test in mouse lymphoma cells.
17.7 Sudden Hearing Loss
Blood pressure was measured manually pre-dose at two time points (-30 and -15 minutes) and then at 1, 2, 3, 4, 5, 6, 7, 8, 10, 12 and 24 hours post dose on the first day of each doxazosin dose, (1 mg, 2 mg, 4 mg), as well as on the seventh day of 4 mg doxazosin administration. Following the first dose of doxazosin 1 mg, there were no outliers on tadalafil 5 mg and one outlier on placebo due to a decrease from baseline in standing systolic BP of >30 mm Hg. There were 2 outliers on tadalafil 5 mg and none on placebo following the first dose of doxazosin 2 mg due to a decrease from baseline in standing systolic BP of >30 mm Hg. There were no outliers on tadalafil 5 mg and two on placebo following the first dose of doxazosin 4 mg due to a decrease from baseline in standing systolic BP of >30 mm Hg. There were two episodes of syncope in this study, one subject following a dose of tadalafil 5 mg alone, and another subject following coadministration of tadalafil 5 mg and doxazosin 4 mg.
Long-term use
Tamsulosin — In the first tamsulosin study, a single oral dose of tadalafil 10, 20 mg, or placebo was administered in a 3 period, crossover design to healthy subjects taking 0.4 mg once per day tamsulosin, a selective alpha[1A]-adrenergic blocker (N=18 subjects). Tadalafil or placebo was administered 2 hours after tamsulosin following a minimum of seven days of tamsulosin dosing. Blood pressure was measured manually at 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, and 24 hours after tadalafil or placebo dosing. In the second tamsulosin study, healthy subjects (N=39 treated; and 35 completed) received 14 days of once per day dosing of tadalafil 5 mg or placebo in a two-period crossover design. Daily dosing of tamsulosin 0.4 mg was added for the last seven days of each period.