Navafil Tablet

Introduction

Navafil Tablet 50 mg is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED) in men. It is designed to improve sexual function by enhancing blood flow to the penis, thus facilitating the achievement and maintenance of an erection during sexual activity.

Uses

Navafil Tablet 50 mg is primarily used for the treatment of erectile dysfunction (ED). It helps men achieve and maintain an erection sufficient for satisfactory sexual performance. The medication can be used in a variety of settings, including:

Management of erectile dysfunction in adult men.
Improving sexual performance and satisfaction in patients with ED.

It is not intended for use in women or for the treatment of sexual dysfunction in women.

Brand Name	Navafil
Type	Tablet
Weight	50 mg
Generic	Avanafil
Manufacturer	Delta Pharma Ltd.
Available in	English বাংলা

Mechanism of Action

Navafil Tablet 50 mg works by selectively inhibiting phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate (cGMP) in the smooth muscle of the corpus cavernosum of the penis. By inhibiting PDE5, Navafil Tablet 50 mg increases the levels of cGMP, which leads to relaxation of smooth muscle and increased blood flow to the penis, facilitating an erection in response to sexual stimulation.

How Long Does It Take to Work?

Navafil Tablet 50 mg typically begins to work within 15 to 30 minutes of ingestion, with peak effects observed around 1 to 2 hours after administration. Its onset of action is generally faster compared to other PDE5 inhibitors, making it suitable for more spontaneous sexual activity.

Absorption

Navafil Tablet 50 mg is rapidly absorbed after oral administration, with a peak plasma concentration reached approximately 1 hour after ingestion. Its absorption may be slightly delayed if taken with a high-fat meal, but the effect remains effective for sexual activity within the recommended time frame.

Route of Elimination

Navafil Tablet 50 mg is primarily metabolized in the liver via cytochrome P450 enzymes (mainly CYP3A4). The drug is excreted primarily in the feces, with a smaller portion excreted in the urine. The metabolism and elimination of Navafil Tablet 50 mg can be influenced by liver function and other medications that affect CYP3A4 activity.

Dosage

The recommended starting dose is 100 mg taken approximately 15 minutes before sexual activity, on an as needed basis. Avanafil may be taken with or without food. Avanafil must not be taken more than once a day. The dose may be increased to 200 mg or decreased to 50 mg based on efficacy and/or tolerability. Use the lowest dose that provides benefit. Concomitant use of nitrates in any form is contraindicated. Do not use Avanafil with strong CYP3A4 inhibitors. If taking a moderate CYP3A4 inhibitor, the dose should be no more than 50 mg in a 24-hour period. In patients on stable alpha-blocker therapy, the recommended starting dose of Avanafil is 50 mg.

The typical dosage of Navafil Tablet 50 mg is as follows:

Initial dose: 100 mg taken approximately 15 to 30 minutes before sexual activity.
Maximum dose: 200 mg per day.
Minimum dose: 50 mg per day, depending on individual response and tolerability.

Dosage should be adjusted based on the patient's response and tolerability, with a maximum of one dose per day.

Administration

Navafil Tablet 50 mg is administered orally in the form of tablets. It can be taken with or without food. For optimal results, it should be taken as directed by a healthcare provider and not more than once per day.

Side Effects

Common side effects of Navafil Tablet 50 mg include:

Headache
Flushing
Nasopharyngitis
Back pain
Sinus congestion

Serious side effects are less common but may include prolonged erection (priapism), sudden vision loss, or sudden hearing loss. Patients should seek medical attention if they experience any severe side effects.

Toxicity

Overdose or excessive use of Navafil Tablet 50 mg can lead to severe adverse effects such as:

Prolonged erection (priapism)
Severe hypotension
Syncope

Treatment of overdose includes supportive care and symptomatic management. In cases of severe adverse reactions, medical intervention may be required.

Precautions

Precautions should be taken for patients with:

Cardiovascular conditions, due to the potential for changes in blood pressure.
Liver or kidney impairment, as dose adjustments may be necessary.
History of priapism or penile deformities, due to the risk of prolonged erections.

Patients should be monitored for adverse effects and dose adjustments may be required based on individual health status.

Interaction

Navafil Tablet 50 mg may interact with:

Nitrates: Concurrent use can cause severe hypotension.
Alpha-blockers: May increase the risk of hypotension.
CYP3A4 inhibitors: May increase Navafil Tablet 50 mg levels, necessitating dose adjustments.

It is important to inform healthcare providers about all other medications being taken to avoid potential interactions.

Disease Interaction

Caution is advised in patients with:

Severe cardiovascular conditions
Liver or renal impairment
Retinitis pigmentosa

Patients with these conditions should be monitored closely, and dose adjustments or alternative therapies may be considered.

Drug Interaction

Drug interactions with Navafil Tablet 50 mg include:

Rifampin: May decrease Navafil Tablet 50 mg effectiveness.
Antifungals (e.g., ketoconazole): May increase Navafil Tablet 50 mg levels.
HIV protease inhibitors (e.g., ritonavir): May increase Navafil Tablet 50 mg levels and the risk of side effects.

Patients should be monitored for interactions, and dose adjustments may be necessary when combining Navafil Tablet 50 mg with other drugs.

Food Interactions

Navafil Tablet 50 mg can be taken with or without food. However, a high-fat meal may delay the onset of action, so it is advisable to avoid large or high-fat meals close to the time of taking the medication if a rapid onset is desired.

Pregnancy Use

Navafil Tablet 50 mg is not indicated for use in women and should not be used during pregnancy. There is limited data on its effects during pregnancy, and its safety has not been established for female patients.

Lactation Use

Navafil Tablet 50 mg is not recommended for use in lactating women. There is no data on the excretion of Navafil Tablet 50 mg in breast milk, and its use should be avoided during breastfeeding.

Acute Overdose

In cases of acute overdose, the primary concerns are severe hypotension, prolonged erection (priapism), and potential cardiovascular effects. Immediate medical attention is required to manage symptoms and prevent complications. Treatment may involve supportive care and monitoring.

Contraindication

Navafil Tablet 50 mg is contraindicated in patients who:

Are taking nitrates or nitric oxide donors, due to the risk of severe hypotension.
Have a known hypersensitivity to Navafil Tablet 50 mg or any of its components.

These contraindications help prevent serious adverse effects and ensure safe use of the medication.

Use Direction

Navafil Tablet 50 mg should be taken exactly as prescribed by a healthcare provider. It is typically taken as needed prior to sexual activity, with a maximum dose of one tablet per day. Patients should follow dosage instructions and consult their healthcare provider if they have any questions or concerns.

Storage Conditions

Navafil Tablet 50 mg should be stored at room temperature, away from moisture and heat. It should be kept in its original container and out of reach of children. Proper storage helps maintain the drug's efficacy and safety.

Volume of Distribution

The volume of distribution for Navafil Tablet 50 mg is approximately 29 L, indicating distribution into body tissues and fluids.

Half Life

The half-life of Navafil Tablet 50 mg is approximately 5 hours. This relatively short half-life allows for its effective use in managing erectile dysfunction with a lower risk of prolonged side effects.

Clearance

Navafil Tablet 50 mg is primarily cleared through the liver, with a smaller proportion cleared through the kidneys. Clearance rates can be influenced by liver function and other medications affecting hepatic metabolism.

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