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Dose-response relationships, between 20 mg and 40 mg, were not observed for 6-minute walk distance or pulmonary vascular resistance (PVR) in subjects with PAH in the placebo-controlled study. Mean change from baseline PVR was -254 dynes*sec*cm -5and -209 dynes*sec*cm -5at 16 weeks in patients receiving 20 mg and 40 mg daily, respectively. Over a dose range of 2.5 to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects. In PAH patients administeredbetween 20 and 40 mg of tadalafil, an approximately 1.5-fold greater AUC was observed indicating a less than proportional increase in exposure over the entire dose range of 2.5 to 40 mg. During tadalafil 20 and 40 mg once daily dosing, steady-state plasma concentrations were attained within 5 days, and exposure was approximately 1.3-fold higher than after a single dose. Absorption— After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 2 and 8 hours (median time of 4 hours). Distribution— The mean apparent volume of distribution following oral administration is approximately 77 L, indicating that tadalafil is distributed into tissues.

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Metabolism— Tadalafil is predominantly metabolized by CYP3A to a catechol metabolite. Elimination— Following 40 mg, the mean oral clearance for tadalafil is 3.4 L/hr and the mean terminal half-life is 15 hours in healthy subjects.

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Although specific interactions have not been studied, other CYP3A inhibitors, such as erythromycin, itraconazole, and grapefruit juice, would likely increase tadalafil exposure. Ritonavir increased tadalafil 20–mg single-dose exposure relative to the values for tadalafil alone. Although specific interactions have not been studied, other HIV protease inhibitors would likely increase tadalafil exposure. Rifampin (600 mg daily), a CYP3A inducer, reduced tadalafil 10 mg single–dose exposure (AUC) by 88% and Cmax by 46%, relative to the values for tadalafil 10 mg alone [see Drug Interactions (7.5)] . Bosentan, a substrate of CYP2C9 and CYP3A and a moderate inducer of CYP3A, CYP2C9 and possibly CYP2C19, reduced tadalafil systemic exposure following multiple-dose co-administration (Figure 2).

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Although specific interactions have not been studied, other CYP3A inducers, such as carbamazepine, phenytoin, and phenobarbital, would likely decrease tadalafil exposure. Exposure changes of tadalafil following co-administration with other drugs are shown in Figure 2. b[see Dosage and Administration (2.4)]. Figure 2: Impact of Other Drugs on the Pharmacokinetics of Tadalafil Tadalafil is not expected to cause clinically significant inhibition or induction of the clearance of drugs metabolized by cytochrome P450 (CYP) isoforms. Exposure changes of drugs following co-administration with tadalafil are shown in Figure 3. Population pharmacokinetics— In patients with pulmonary hypertension not receiving concomitant bosentan, the average tadalafil exposure at steady-state following 40 mg was 26% higher when compared to those of healthy volunteers. The results suggest a lower clearance of tadalafil in patients with pulmonary hypertension compared to healthy volunteers.

In healthy male elderly subjects (65 years or over) after a 10 mg dose, a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on C maxwas observed relative to that in healthy subjects 19 to 45 years of age. In clinical pharmacology studies using single-dose tadalafil (5 to 10 mg), tadalafil exposure (AUC) doubled in subjects with mild (creatinine clearance 51 to 80 mL/min) or moderate (creatinine clearance 31 to 50 mL/min) renal impairment. Hemodialysis (performed between 24 and 30 hours post-dose) contributed negligibly to tadalafil or metabolite elimination [see Dosage and Administration ( 2.2)] . Insufficient data are available for subjects with severe hepatic impairment (Child-Pugh Class C) [see Dosage and Administration ( 2.3)] . In male patients with diabetes mellitus after a cialis tadalafil 20mg 10 mg tadalafil dose, exposure (AUC) was reduced approximately 19% and Cmaxwas 5% lower than that observed in healthy subjects. Pharmacokinetic studies have included subjects from different ethnic groups, and no differences in the typical exposure to tadalafil have been identified. In healthy female and male subjects following single and multiple-doses of tadalafil, no clinically relevant differences in exposure (AUC and C max) were observed. Tadalafil is a substrate of and predominantly metabolized by CYP3A. Ketoconazole increased tadalafil exposure relative to the values for tadalafil alone (Figure 2). Although specific interactions have not been studied, other CYP3A inhibitors, such as erythromycin, itraconazole, and grapefruit juice, would likely increase tadalafil exposure. Ritonavir increased tadalafil 20–mg single-dose exposure relative to the values for tadalafil alone.

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The abnormal blood–cell findings were reversible within 2 weeks upon removal of the drug. Carcinogenesis— Tadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 5–fold for mice, and 7– and 14–fold for male and female rats, respectively, the exposures at the maximum recommended human dose (MRHD) of 40 mg. Mutagenesis— Tadalafil was not mutagenic in the in vitrobacterial Ames assays or the forward mutation test in mouse lymphoma cells. Impairment of Fertility— There were no effects on fertility, reproductive performance or reproductive organ morphology in male or female rats given oral doses of tadalafil up to 400 mg/kg/day, a dose producing AUCs for unbound tadalafil of 6–fold for males or 17–fold for females the exposures at the MRHD of 40 mg.

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Systemic exposure (based on AUC) at no–observed–adverse-effect–level (NOAEL) (10 mg/kg/day) for unbound tadalafil was similar to that expected in humans at the MRHD of 40 mg. There were no treatment–related testicular findings in rats or mice treated with doses up to 400 mg/kg/day for 2 years. Animal studies showed vascular inflammation in tadalafil–treated mice, rats, and dogs. 14 CLINICAL STUDIES 14.1 Tadalafil tablets for Pulmonary Arterial HypertensionA randomized, double-blind, 16 week placebo-controlled study was conducted in 405 patients with pulmonary arterial hypertension, defined as a resting mean pulmonary artery pressure (mPAP) ≥25 mm Hg, pulmonary capillary wedge pressure (PCWP) ≤15 mm Hg, and pulmonary vascular resistance (PVR) ≥3 Wood units via right heart catheterization. Allowed background therapy included bosentan (maintenance dosing up to 125 mg twice daily) and chronic anticoagulation. Although specific interactions have not been studied, other HIV protease inhibitors would likely increase tadalafil exposure.

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Rifampin (600 mg daily), a CYP3A inducer, reduced tadalafil 10 mg single–dose exposure (AUC) by 88% and Cmax by 46%, relative to the values for tadalafil 10 mg alone [see Drug Interactions (7.5)] .

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The results suggest a lower clearance of tadalafil in patients with pulmonary hypertension compared to healthy volunteers. In healthy male elderly subjects (65 years or over) after a 10 mg dose, a lower oral clearance of tadalafil, resulting in 25% higher exposure (AUC) with no effect on C maxwas observed relative to that in healthy subjects 19 to 45 years of age. In clinical pharmacology studies using single-dose tadalafil (5 to 10 mg), tadalafil exposure (AUC) doubled in subjects with mild (creatinine clearance 51 to 80 mL/min) or moderate (creatinine clearance 31 to 50 mL/min) renal impairment. Hemodialysis (performed between 24 and 30 hours post-dose) contributed negligibly to tadalafil or metabolite elimination [see Dosage and Administration ( 2.2)] . Insufficient data are available for subjects with severe hepatic impairment (Child-Pugh Class C) [see Dosage and Administration ( 2.3)] .

Pulmonary arterial hypertension

In male patients with diabetes mellitus after a cialis tadalafil 20mg 10 mg tadalafil dose, exposure (AUC) was reduced approximately 19% and Cmaxwas 5% lower than that observed in healthy subjects. Pharmacokinetic studies have included subjects from different ethnic groups, and no differences in the typical exposure to tadalafil have been identified. In healthy female and male subjects following single and multiple-doses of tadalafil, no clinically relevant differences in exposure (AUC and C max) were observed. Tadalafil is a substrate of and predominantly metabolized by CYP3A. Ketoconazole increased tadalafil exposure relative to the values for tadalafil alone (Figure 2). Bosentan, a substrate of CYP2C9 and CYP3A and a moderate inducer of CYP3A, CYP2C9 and possibly CYP2C19, reduced tadalafil systemic exposure following multiple-dose co-administration (Figure 2).

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Although specific interactions have not been studied, other CYP3A inducers, such as carbamazepine, phenytoin, and phenobarbital, would likely decrease tadalafil exposure. Exposure changes of tadalafil following co-administration with other drugs are shown in Figure 2. b[see Dosage and Administration (2.4)]. Figure 2: Impact of Other Drugs on the Pharmacokinetics of Tadalafil Tadalafil is not expected to cause clinically significant inhibition or induction of the clearance of drugs metabolized by cytochrome P450 (CYP) isoforms.

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Exposure changes of drugs following co-administration with tadalafil are shown in Figure 3. aA small augmentation (increase of 3 beats per minute) in heart rate was observed with theophylline.

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aA small augmentation (increase of 3 beats per minute) in heart rate was observed with theophylline. bTadalafil (40 mg qd) had no clinically significant cialis tablet price effect on exposure (AUC and C max) of bosentan metabolites. Figure 3: Impact of Tadalafil on the Pharmacokinetics of Other Drugs 13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of FertilityCarcinogenesis— Tadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 5–fold for mice, and 7– and 14–fold for male and female rats, respectively, the exposures at the maximum recommended human dose (MRHD) of 40 mg.Mutagenesis— Tadalafil was not mutagenic in the in vitrobacterial Ames assays or the forward mutation test in mouse lymphoma cells. Tadalafil was not clastogenic in the in vitro chromosomal aberration test in human lymphocytes or the in vivo rat micronucleus assays.Impairment of Fertility— There were no effects on fertility, reproductive performance or reproductive organ morphology in male or female rats given oral doses of tadalafil up to 400 mg/kg/day, a dose producing AUCs for unbound tadalafil of 6–fold for males or 17–fold for females the exposures at the MRHD of 40 mg.

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In beagle dogs given tadalafil daily for 3 to 12 months, there was treatment–related non–reversible degeneration and atrophy of the seminiferous tubular epithelium in the testes in 20 to 100% of the dogs that resulted in a decrease in spermatogenesis in 40 to 75% of the dogs at doses of ≥10 mg/kg/day. Systemic exposure (based on AUC) at no–observed–adverse-effect–level (NOAEL) (10 mg/kg/day) for unbound tadalafil was similar to that expected in humans at the MRHD cialis over the counter uk of 40 mg.There were no treatment–related testicular findings in rats or mice treated with doses up to 400 mg/kg/day for 2 years.13.2 Animal Toxicology and/or PharmacologyAnimal studies showed vascular inflammation in tadalafil–treated mice, rats, and dogs. In mice and rats, lymphoid necrosis and hemorrhage were seen in the spleen, thymus, and mesenteric lymph nodes at unbound tadalafil exposure of 1– to 17–fold the human exposure (AUCs) at the MRHD of 40 mg. In dogs, an increased incidence of disseminated arteritis was observed in 1– and 6-month studies at unbound tadalafil exposure of 0.5– to 38–fold the human exposure (AUC) at the MRHD of 40 mg. In a 12–month dog study, no disseminated arteritis was observed, but 2 dogs exhibited marked decreases in white blood cells (neutrophils) and moderate decreases in platelets with inflammatory signs at unbound tadalafil exposures of approximately 4– to 10–fold the human exposure at the MRHD of 40 mg. bTadalafil (40 mg qd) had no clinically significant cialis tablet price effect on exposure (AUC and C max) of bosentan metabolites. Figure 3: Impact of Tadalafil on the Pharmacokinetics of Other Drugs 13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of FertilityCarcinogenesis— Tadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 5–fold for mice, and 7– and 14–fold for male and female rats, respectively, the exposures at the maximum recommended human dose (MRHD) of 40 mg.Mutagenesis— Tadalafil was not mutagenic in the in vitrobacterial Ames assays or the forward mutation test in mouse lymphoma cells.

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The use of prostacyclin or analogue, L–arginine, phosphodiesterase inhibitor, or other chronic PAH medications were not permitted.Subjects were randomly assigned to 1 of 5 treatment groups (tadalafil 2.5, 10, 20, 40 mg, or placebo) in a 1:1:1:1:1 ratio. Subjects had to be at least 12 years of age and had a diagnosis of PAH that was idiopathic, heritable, related to connective tissue disease, anorexigen use, human immunodeficiency virus (HIV) infection, associated with an atrial-septal defect, or associated with surgical repair of a congenital systemic-to-pulmonary shunt of least 1 year in duration (for example, ventricular septal defect, patent ductus arteriosus). Patients with a history of left-sided heart disease, severe renal insufficiency, or pulmonary hypertension related to conditions other than specified in the inclusion criteria were not eligible for enrollment.The mean age of all subjects was 54 years (range 14 to 90 years) with the majority of subjects being Caucasian (81%) and female (78%). Tadalafil was not clastogenic in the in vitro chromosomal aberration test in human lymphocytes or the in vivo rat micronucleus assays.Impairment of Fertility— There were no effects on fertility, reproductive performance or reproductive organ morphology in male or female rats given oral doses of tadalafil up to 400 mg/kg/day, a dose producing AUCs for unbound tadalafil of 6–fold for males or 17–fold for females the exposures at the MRHD of 40 mg. In beagle dogs given tadalafil daily for 3 to 12 months, there was treatment–related non–reversible degeneration and atrophy of the seminiferous tubular epithelium in the testes in 20 to 100% of the dogs that resulted in a decrease in spermatogenesis in 40 to 75% of the dogs at doses of ≥10 mg/kg/day. Systemic exposure (based on AUC) at no–observed–adverse-effect–level (NOAEL) (10 mg/kg/day) for unbound tadalafil was similar to that expected in humans at the MRHD cialis over the counter uk of 40 mg.There were no treatment–related testicular findings in rats or mice treated with doses up to 400 mg/kg/day for 2 years.13.2 Animal Toxicology and/or PharmacologyAnimal studies showed vascular inflammation in tadalafil–treated mice, rats, and dogs.

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Dose-response relationships, between 20 mg and 40 mg, were not observed for 6-minute walk distance or pulmonary vascular resistance (PVR) in subjects with PAH in the placebo-controlled study. Mean change from baseline PVR was -254 dynes*sec*cm -5and -209 dynes*sec*cm -5at 16 weeks in patients receiving 20 mg and 40 mg daily, respectively. Over a dose range of 2.5 to 20 mg, tadalafil exposure (AUC) increases proportionally with dose in healthy subjects. In PAH patients administeredbetween 20 and 40 mg of tadalafil, an approximately 1.5-fold greater AUC was observed indicating a less than proportional increase in exposure over the entire dose range of 2.5 to 40 mg. During tadalafil 20 and 40 mg once daily dosing, steady-state plasma concentrations were attained within 5 days, and exposure was approximately 1.3-fold higher than after a single dose.

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Absorption— After single oral-dose administration, the maximum observed plasma concentration (Cmax) of tadalafil is achieved between 2 and 8 hours (median time of 4 hours). Distribution— The mean apparent volume of distribution following oral administration is approximately 77 L, indicating that tadalafil is distributed into tissues. Metabolism— Tadalafil is predominantly metabolized by CYP3A to a catechol metabolite. Elimination— Following 40 mg, the mean oral clearance for tadalafil is 3.4 L/hr and the mean terminal half-life is 15 hours in healthy subjects. Population pharmacokinetics— In patients with pulmonary hypertension not receiving concomitant bosentan, the average tadalafil exposure at steady-state following 40 mg was 26% higher when compared to those of healthy volunteers. In mice and rats, lymphoid necrosis and hemorrhage were seen in the spleen, thymus, and mesenteric lymph nodes at unbound tadalafil exposure of 1– to 17–fold the human exposure (AUCs) at the MRHD of 40 mg. In dogs, an increased incidence of disseminated arteritis was observed in 1– and 6-month studies at unbound tadalafil exposure of 0.5– to 38–fold the human exposure (AUC) at the MRHD of 40 mg. In a 12–month dog study, no disseminated arteritis was observed, but 2 dogs exhibited marked decreases in white blood cells (neutrophils) and moderate decreases in platelets with inflammatory signs at unbound tadalafil exposures of approximately 4– to 10–fold the human exposure at the MRHD of 40 mg.

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The abnormal blood–cell findings were reversible within 2 weeks upon removal of the drug. Carcinogenesis— Tadalafil was not carcinogenic to rats or mice when administered daily for 2 years at doses up to 400 mg/kg/day. Systemic drug exposures, as measured by AUC of unbound tadalafil, were approximately 5–fold for mice, and 7– and 14–fold for male and female rats, respectively, the exposures at the maximum recommended human dose (MRHD) of 40 mg. Mutagenesis— Tadalafil was not mutagenic in the in vitrobacterial Ames assays or the forward mutation test in mouse lymphoma cells. Impairment of Fertility— There were no effects on fertility, reproductive performance or reproductive organ morphology in male or female rats given oral doses of tadalafil up to 400 mg/kg/day, a dose producing AUCs for unbound tadalafil of 6–fold for males or 17–fold for females the exposures at the MRHD of 40 mg. Systemic exposure (based on AUC) at no–observed–adverse-effect–level (NOAEL) (10 mg/kg/day) for unbound tadalafil was similar to that expected in humans at the MRHD of 40 mg. There were no treatment–related testicular findings in rats or mice treated with doses up to 400 mg/kg/day for 2 years.

Animal studies showed vascular inflammation in tadalafil–treated mice, rats, and dogs. 14 CLINICAL STUDIES 14.1 Tadalafil tablets for Pulmonary Arterial HypertensionA randomized, double-blind, 16 week placebo-controlled study was conducted in 405 patients with pulmonary arterial hypertension, defined as a resting mean pulmonary artery pressure (mPAP) ≥25 mm Hg, pulmonary capillary wedge pressure (PCWP) ≤15 mm Hg, and pulmonary vascular resistance (PVR) ≥3 Wood units via right heart catheterization. Allowed background therapy included bosentan (maintenance dosing up to 125 mg twice daily) and chronic anticoagulation. The use of prostacyclin or analogue, L–arginine, phosphodiesterase inhibitor, or other chronic PAH medications were not permitted.Subjects were randomly assigned to 1 of 5 treatment groups (tadalafil 2.5, 10, 20, 40 mg, or placebo) in a 1:1:1:1:1 ratio. Subjects had to be at least 12 years of age and had a diagnosis of PAH that was idiopathic, heritable, related to connective tissue disease, anorexigen use, human immunodeficiency virus (HIV) infection, associated with an atrial-septal defect, or associated with surgical repair of a congenital systemic-to-pulmonary shunt of least 1 year in duration (for example, ventricular septal defect, patent ductus arteriosus). Patients with a history of left-sided heart disease, severe renal insufficiency, or pulmonary hypertension related to conditions other than specified in the inclusion criteria were not eligible for enrollment.The mean age of all subjects was 54 years (range 14 to 90 years) with the majority of subjects being Caucasian (81%) and female (78%).