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Usual Pediatric Dose for Pulmonary Hypertension

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8.7 Hepatic Impairment

Note: Introduction and Additional Common Questions written and medically approved by Cleveland Clinic professionals. It therefore increases levels of cyclic guanosine monophosphate (cGMP), which leads to the activation of cGMP-dependent protein kinases that mediate vascular smooth muscle relaxation and thus vasodilation.95 Newer data implicate the role of cGMP-dependent protein kinases in the reversal of ventricular hypertrophy by inhibiting downstream hypertrophy signaling96 (Figure 50-6). Sildenafil has been shown to be beneficial in the treatment of patients with pulmonary hypertension by decreasing pulmonary artery pressures without having a significant effect on systemic pressures. The development of pulmonary hypertension in patients with heart failure portends worse outcomes and can be a contraindication to therapies such as cardiac transplantation.97 Sildenafil has been evaluated for the treatment of systolic heart failure in small clinical trials. Lewis and associates98 evaluated the acute effect of sildenafil on invasive cardiac hemodynamics, gas exchange, and first-pass radionuclide ventriculography at rest and during exercise in 13 patients with NYHA class III heart failure.

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Sildenafil administration was associated with reductions in resting pulmonary arterial pressure, systemic vascular resistance, and pulmonary vascular resistance and with an increase in resting cardiac index, without altering mean arterial pressure, heart rate, or pulmonary capillary wedge pressure. During exercise, sildenafil reduced pulmonary arterial pressure and pulmonary vascular resistance. Moreover, peak oxygen consumption (Vo2max) increased, ventilatory response to carbon dioxide output (Ve/Vco2 slope) decreased, and right ventricular ejection fraction increased after sildenafil administration. Thus, the investigators were able to demonstrate that sildenafil has a selective pulmonary vasodilator effect with little effect on systemic blood pressure, heart rate, and pulmonary capillary wedge pressure. The pulmonary vasodilator effect leads to an increase in right ventricular function and, possibly as a result, an increase in cardiac output.98 The increase in cardiac output, together with other mechanisms, may have contributed to improvements in exercise capacity.

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Of note, the one other selective pulmonary vasodilator, inhaled nitric oxide, has the disadvantage of increasing pulmonary capillary wedge pressure and inducing pulmonary edema in patients with heart failure.99 In another trial, Bussotti and colleagues100 evaluated the acute effects of sildenafil on pulmonary mechanics at rest and with exercise by administering 25-mg and 100-mg doses of sildenafil to 22 male patients with systolic heart failure (NYHA class II or III). Sildenafil administration was associated with enhancements in pulmonary perfusion, gas diffusion, and lung mechanics. Subsequent studies have been performed to examine the chronic efficacy of sildenafil in patients with heart failure. Lewis and associates98 randomly assigned 34 patients with NYHA functional class II or III heart failure (LVEF < 40%) and pulmonary hypertension (mean pulmonary arterial pressure > 25 mm Hg) to receive 12 weeks of treatment with sildenafil or placebo. Sildenafil-treated patients demonstrated a significantly greater increase in Vo2max and significantly lower resting pulmonary vascular resistance. All our board-cerified doctors and pharmacists are based in the US.

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Sildenafil is a tablet that’s taken 30–60 minutes before sex.

8.6 Renal Impairment

The remaining resting hemodynamic parameters sildenafil 60mg did not differ significantly between sildenafil- and placebo-treated patients. With exercise, sildenafil-treated patients exhibited a significant decrease in pulmonary vascular resistance and increases in stroke volume and cardiac output in comparison to placebo recipients. Moreover, sildenafil-treated patients demonstrated a significant increase in right ventricular ejection fraction at rest and with exercise but no change in LV size or LVEF. With regard to symptoms, the Minnesota Living with Heart Failure score and the NYHA functional class improved significantly in the sildenafil-treated patients. Rates of adverse events were similar in the two groups except for headaches, which were more frequent in sildenafil-treated patients.

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Lewis and associates concluded that in patients with systolic heart failure with pulmonary hypertension, prolonged administration of sildenafil safely decreased pulmonary vascular resistance, improved right ventricular function, and, possibly as a result of these occurrences, led to an increase in stroke volume and cardiac output. In addition, sildenafil significantly improved Vo2max.98 These findings by themselves are very valuable but are also important in the context of safety: Sildenafil can be safely used in patients with heart failure and pulmonary hypertension, in contrast to other pulmonary vasodilators. In contrast, the endothelin antagonist bosentan has been associated with fluid retention and failure to improve symptoms of heart failure,101 and the prostacyclin analogue epoprostenol has been associated with increased mortality, especially in patients with coronary artery disease.102 Researchers in a second trial also evaluated the chronic effect of sildenafil on hemodynamics, as well as exercise dynamics. Guazzi and coworkers103 randomly assigned 46 male patients with NYHA functional class II or III heart failure (the presence of pulmonary hypertension was not necessary for inclusion) to receive sildenafil or placebo. At 3 and 6 months, the sildenafil-treated patients demonstrated a reduction in systolic pulmonary artery pressure, a reduction in ergoreflex effect on ventilation, an improvement in Vco2 production slope and Vo2max, and improvements in breathlessness score and flow-mediated vasodilation.

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The improvement in exercise efficiency was attributed to improved cardiopulmonary hemodynamics and improved sensitivity of the ergoventilatory reflex (a reflex that couples mechanoreceptors or chemoreceptors, or both, in exercising skeletal muscle to the control of ventilation), which, in turn, was possibly a result of improved skeletal muscle perfusion. The increase in cardiac output with sildenafil treatment has been attributed largely to an improvement in right ventricular function (which results from a decrease in pulmonary artery pressures) and to a decrease in systemic vascular resistance. Several observations support the concept that sildenafil has positive inotropic properties. In patients given inhaled nitric oxide with comparable reductions in the pulmonary vascular resistance, an increase in cardiac output was not noted in comparison to sildenafil.104 Moreover, Nagendran and associates105 confirmed a lack of phosphodiesterase type 5 in normal human right ventricular myocardium but were able to demonstrate its presence in hypertrophied right ventricular myocardium. In addition, they were able to show a positive inotropic effect with phosphodiesterase type 5 inhibition in this tissue. Its effects can last for up to 6 hours when aroused.

Parameter	Value	Time to Peak	Notes
Absorption Rate	Rapid, oral administration	30-120 min	Depends on food intake
Half-life	Approximately 4 hours	-	Duration of effect
Bioavailability	About 40%	-	Percentage of drug reaching systemic circulation
Metabolism	Liver (via CYP3A4 enzyme)	-	Mainly via hepatic pathways

Tadalafil is a tablet that can either be taken 30–60 minutes before sex at higher

Country/Region	Approval Status	Regulatory Body	Remarks
United States	Approved by FDA	FDA	Prescription-only medication
European Union	Approved under EMA	EMA	Prescription only
Canada	Approved by Health Canada	Health Canada	Prescription medication
Australia	Approved by TGA	TGA	Prescription required

strengths (10mg/20mg), or daily at lower strengths (2.5mg/5mg) if you don’t want to plan ahead. The effects of tadalafil can last up to 36 hours when aroused.

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The mechanism of positive inotropy remains to be elucidated. Moreover, novel exciting data suggest that cGMP-dependent protein kinases are involved in the reversal of myocardial hypertrophy and subsequent improvement in ventricular function; thus, phosphodiesterase type 5 inhibitors may have a role in the treatment of ventricular hypertrophy and reverse remodeling. In an animal model of ventricular hypertrophy induced by pressure overload, sildenafil administration prevented the development of ventricular hypertrophy and, in animals with established hypertrophy, reversed the hypertrophy. The postulated mechanisms are improved calcium handling, sildenafil-induced increase in cGMP concentration, and thus increase in cGMP-dependent protein kinase activity, which in turn appears to lead to a decrease in downstream hypertrophy signaling. At the same time, animals treated with sildenafil showed an improvement in ventricular systolic function.96,106 These findings are very encouraging and suggest that sil-denafil may successfully and safely decrease pulmonary artery pressures in patients with systolic heart failure and improve symptoms and exercise capacity even in patients with heart failure but without significant pulmonary hypertension.103 Larger prospective clinical trials are needed to confirm these findings and to evaluate the benefit of this agent on morbidity and mortality outcomes in patients with systolic heart failure.

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Moreover, the evidence that sildenafil may reverse hypertrophy suggests that it may have a role in the treatment of diastolic heart failure, as reviewed in detail in Chapter 48. Getting your confidence back has never been easier. Access FDA-approved erectile dysfunction pills by filling out a 2 minute online form. Then choose from recommended treatments, tailored for you. 1Tell us about your healthFill sildenafil 20 mg prescription out some questions about your medical history in a few minutes. If you’re planing to take in an hour before sex,

Patient Group	Typical Dose	Timing	Notes
Adult men with ED	100 mg as needed	30-60 min before sex	Max once per day
Patients with PAH	20-40 mg two times daily	With meals	Adjust dose based on response
Elderly patients	Start at 50 mg	As prescribed	Caution due to potential interactions

men usually start with the 10mg dose to minimize side effects.

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