Clinical Trials and Efficacy Data

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.

Patient Group	Starting Dose	Maximum Dose	Frequency	Notes
Adult Men with ED	50 mg	100 mg	Once per day, 1 hour before sex	Adjust based on efficacy and side effects
Patients with Liver Impairment	25 mg	50 mg	Once daily	Lower doses recommended
Elderly Patients	25-50 mg	100 mg	As needed	Monitor for side effects

The improvement in exercise efficiency was attributed to improved cardiopulmonary hemodynamics and

What happens if I miss a dose?

Rates of adverse events were similar in the two groups except for headaches, which were more frequent in sildenafil-treated patients. 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. improved sensitivity of the ergoventilatory reflex (a reflex that couples mechanoreceptors or

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chemoreceptors, or both, in exercising skeletal muscle to the control of ventilation), which, in turn, was possibly a result of improved skeletal muscle perfusion.

Country	Approval Status	Regulatory Agency	Notes
USA	Approved	FDA	For ED and pulmonary hypertension
European Union	Approved	EMA	Similar indications
India	Approved	CDSCO	Generic versions available
Australia	Approved	TGA	Prescription required

The increase in cardiac output with sildenafil treatment has been attributed largely to an improvement in right ventricular

Dosage Forms and Administration

Keep all medications away from children and pets. Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste sildenafil oral solution disposal company. Ask a clinical question and tap into Healio AI's knowledge base.

Does Viagra prevent ejaculation?

Healio's exclusive daily news coverage of clinical data Selected from data included with permission and copyrighted by FDB, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution in professional health care settings. CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of your healthcare professional. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you. You should consult your healthcare professional before taking any drug, changing your diet or commencing or discontinuing any course of treatment.

Does sildenafil interact with foods or drinks?

This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking any drug or commencing or discontinuing any course of treatment. 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. function (which results from a decrease in pulmonary artery pressures) and to a decrease in systemic vascular resistance.

• Sildenafil citrate was first approved by the FDA in 1998.
• Its brand name is Viagra, but generic versions are available.
• The drug is available in tablets of various strengths, typically 25-100 mg.
• It can be prescribed for both men and in specific cases, women.
• Proper dosage varies based on health status and response.
• Use caution in patients with heart problems or low blood pressure.
• It is not a hormone or a testosterone booster.

Several observations support the concept that sildenafil has positive inotropic properties.

Enhancing Healthcare Team Outcomes

Sildenafil is also available in other brands and strengths for high blood pressure in the lungs (pulmonary hypertension). chronic kidney disease stage 4 (severe) GFR 15-29 mL/min chronic kidney disease stage 5 (failure) GFR<15 mL/min kidney disease with likely reduction in glomerular filtration rate (GFR) Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Sildenafil Tablets or Oral Suspension for PAH

Some products that may interact with this drug are: riociguat, vericiguat. Sildenafil can cause a serious drop in your blood pressure when used with nitrates. A serious drop in blood pressure can lead to dizziness, fainting, and rarely heart attack or stroke. Do not use sildenafil with any of the following: certain drugs used to treat chest pain/angina (nitrates such as nitroglycerin, isosorbide), recreational drugs called "poppers" containing amyl or butyl nitrite. If you are also taking an alpha blocker medication (such as doxazosin, tamsulosin) to treat an enlarged prostate/BPH or high blood pressure, your blood pressure may get too low which can lead to dizziness or fainting.

Treatment & Diagnosis

Your doctor may start treatment with a lower dose of sildenafil to minimize your risk of low blood pressure. Other medications can affect the removal of sildenafil from your body, which may affect how sildenafil works. Examples include azole antifungals (such as itraconazole, ketoconazole), macrolide antibiotics (such as clarithromycin, erythromycin), mifepristone, rifampin, ritonavir, among others. Do not take this medication with any other product that contains sildenafil or other similar medications for erectile dysfunction-ED or pulmonary hypertension (such as tadalafil, vardenafil). Store at room temperature away from light and moisture. In patients given inhaled nitric oxide with comparable reductions in the pulmonary vascular

Society and culture

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. 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 spray 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.

Sildenafil vs. tadalafil

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. 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.

How it works

Sildenafil-treated patients demonstrated a significantly greater increase in Vo2max and significantly lower resting pulmonary vascular resistance. The remaining resting hemodynamic parameters 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. resistance, an increase in cardiac output was not noted in comparison to sildenafil.104 Moreover,

Side Effect	Severity	Common Symptoms	Frequency
Headache	Mild to Moderate	Throbbing pain, sensation of pressure	Very common
Flushing	Mild	Skin redness, warmth	Common
Dyspepsia (Indigestion)	Mild	Burning sensation in stomach	Common
Visual disturbances	Mild to moderate	Blue tint, blurred vision	Less common
Priapism	Severe	Prolonged and painful erection	Rare

Nagendran and associates105 confirmed a lack of phosphodiesterase type 5 in normal human right

• Some users report headaches and dizziness after taking sildenafil.
• A common side effect is facial flushing and nasal congestion.
• Rare side effects include sudden hearing loss or vision loss.
• Priapism requires urgent medical attention to prevent tissue damage.
• Sudden vision loss should be immediately evaluated by a doctor.
• Allergic reactions such as rash, hives, or swelling are possible.
• Discontinue use and seek medical help if serious side effects occur.

ventricular myocardium but were able to demonstrate its presence in hypertrophied right ventricular myocardium.

• Sildenafil is unsuitable for individuals with severe liver disease.
• Patients should avoid alcohol consumption during treatment.
• Some side effects may resolve on their own within hours.
• Persistent side effects should prompt medical consultation.
• The drug does not cure ED but manages symptoms.
• Lifestyle changes can also improve erectile function.
• Follow your healthcare provider’s instructions precisely.