Viagra(Sildenafil Citrate) Raws Powder CAS：171599-83-0

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Viagra (scientific name: **Sildenafil Citrate**) is a drug used to treat male erectile dysfunction (ED, commonly known as impotence). Sildenafil was originally developed by Pfizer as an oral medication, usually in the form of **Sildenafil Citrate**. It helps men achieve and maintain an erection by inhibiting an enzyme called **PDE5 (phosphodiesterase type 5)** to enhance blood flow to the penis.

### **Viagra (Sildenafil Citrate) Raw Powder**

Raw powder refers to the unprocessed raw material form of the drug, which is usually used for preparation production, formula development or for research and testing. For the raw powder of Sildenafil Citrate, it is usually a white or off-white crystalline powder, which is used as a raw material in the drug manufacturing process in most cases.

### **Physical and chemical properties**:

- **Chemical name**: Sildenafil Citrate

- **Molecular formula**: C22H30N6O4S

- **Molecular weight**: 474.58 g/mol

- **Appearance**: White or nearly white crystalline powder

- **Solubility**: Sildenafil has relatively low solubility in water, but can be dissolved well in alcohol solvents such as ethanol.

- **Melting point**: about 185°C

Sildenafil as the active ingredient of the drug usually exists in its Citrate salt form because this salt form has good water solubility and stability, which is conducive to the absorption of oral dosage forms.

### **Pharmacology and mechanism**:

The main mechanism of action of Sildenafil is to increase the concentration of cGMP (cyclic guanosine monophosphate) in the body by inhibiting **PDE5 (phosphodiesterase type 5)**. cGMP is a key molecule in smooth muscle relaxation and vasodilation, so by increasing cGMP levels, Sildenafil helps improve blood flow to the blood vessels of the penis, which in turn helps men get and maintain an erection in response to sexual stimulation.

In addition, Sildenafil can also be used to treat pulmonary hypertension because it dilates blood vessels and reduces blood pressure in the lungs.

### **Dosage**:

For adult men, the usual dose of Sildenafil is as follows:

- **Standard dose**: Usually starts with 50 mg, taken orally as needed, about 30 minutes to 1 hour before sexual intercourse.

- **Maximum dose**: Should not exceed 100 mg per day. The dose can be adjusted based on the patient's response and tolerance. Common doses are 50 mg or 100 mg.

- **Minimum dose**: In some patients, especially the elderly or those with liver and kidney dysfunction, it may be started with 25 mg.

For the treatment of pulmonary hypertension, the dose will vary, usually 20 mg three times/day.

### **Half-life**:

The **half-life** of Sildenafil is approximately **4 hours**. This means that after ingestion, the drug concentration in the blood will drop to half of its original concentration after about 4 hours. The length of the half-life is affected by many factors, such as the individual's liver metabolism function, the frequency of medication, whether other drugs are used at the same time, etc.

### **Bioavailability**:

The **oral bioavailability** of Sildenafil is approximately **40%**. This means that although a large part of the drug enters the gastrointestinal tract, not all of the drug can eventually reach the circulation system. Food intake may slow its absorption, especially high-fat foods may delay its onset of action.

### **Period and duration of action**:

- **Onset**: Sildenafil usually starts to work within 30 minutes to 1 hour after oral administration.

- **Duration**: The drug's duration of action is approximately 4 to 6 hours, and the specific duration varies depending on individual differences (such as weight, age, health status, etc.). Usually, during this period, the patient is able to achieve and maintain an erection when sexually stimulated.

### **Metabolism and Excretion**:

- **Metabolism**: Sildenafil is primarily metabolized by cytochrome P450 enzymes (particularly CYP3A4) in the liver, where it is converted into its active metabolites.

- **Excretion**: Sildenafil and its metabolites are excreted in the urine. Approximately 80% is excreted in the urine, and the remainder is excreted in the feces.

### **Side Effects and Risks**:

Sildenafil is a clinically proven drug that is generally safe, but may cause some side effects, especially in overdose. Common side effects include:

- Headache

- Facial flushing

- Stomach upset

- Blurred vision or abnormal color vision (usually manifested as cyan vision)

- Nasal congestion or flu symptoms

**Serious side effects** (less common):

- A persistent erection (erection lasting more than 4 hours) is called **Priapism**, which can cause permanent damage if not treated promptly.

- Cardiovascular problems, especially in patients with existing heart disease, should be used with caution when using Sildenafil.

- Hypotension, especially when used with nitrate-containing drugs.

### **Contraindications and precautions**:

1. **Patients with heart disease**: Sildenafil should not be used if the patient is taking nitrate drugs (such as those used to treat angina) because the combination of the two can cause low blood pressure.

2. **Patients with hepatic and renal insufficiency**: Sildenafil metabolism mainly depends on the liver, so patients with hepatic insufficiency may need to reduce the dose. Patients with renal insufficiency should also adjust the dose according to specific circumstances.

3. **Other drug interactions**: Sildenafil may interact with other drugs, especially some antifungal drugs, antibiotics, and certain antihypertensive drugs. Patients should use it under the guidance of a doctor.

### **Conclusion**:

Viagra (Sildenafil Citrate) is a commonly used drug used to treat male erectile dysfunction. It helps men get and maintain an erection by increasing blood flow to the penis. Its raw powder form is usually used in drug production or laboratory research and has good solubility and stability. Use requires attention to dosage, timing of medication, and potential side effects, especially in patients with cardiovascular disease or other comorbidities.

Viagra (Sildenafil Citrate) raw powder is a drug for the treatment of erectile dysfunction (ED) and is usually sold as a prescription drug. It is usually sold in the form of tablets on the market, but it is also available as raw powder for the manufacture of drugs. The following is a detailed introduction to the applicable population, working principle, usage and dosage of sildenafil raw powder:

### 1. **Applicable population**

Sildenafil is mainly used for the following populations:

- **Male erectile dysfunction (ED) patients**: men who cannot obtain or maintain an erection sufficient to complete sexual intercourse under sexual stimulation.

- **Pulmonary arterial hypertension (PAH) patients**: Under the guidance of a doctor, sildenafil is also used to treat pulmonary arterial hypertension to help lower pulmonary blood pressure.

- **Cardiovascular disease-related sexual dysfunction**: For sexual dysfunction caused by cardiovascular problems, sildenafil may be considered as a treatment option.

### 2. **Working principle**

Sildenafil exerts its therapeutic effect by enhancing the effect of nitric oxide. The specific mechanism is as follows:

- **Inhibition of PDE5 enzyme (phosphodiesterase 5)**: Sildenafil can inhibit the activity of PDE5 enzyme, which breaks down cyclic adenosine monophosphate (cGMP). cGMP is a key molecule that regulates smooth muscle relaxation, especially in blood vessels. By inhibiting PDE5, sildenafil can increase the level of cGMP, thereby relaxing penile smooth muscle and dilating blood vessels, increasing blood flow, and helping men achieve erections under sexual stimulation.

- **Effective under the premise of sexual stimulation**: Sildenafil does not automatically cause erections, it needs to be used with sexual stimulation to produce an effect.

### 3. **Usage and Dosage**

- **Dosage**: The common dose for adult men is **50 mg**, which can be adjusted to **25 mg** or **100 mg** depending on the individual's effect and tolerance.

- **How ​​to take**: Sildenafil is usually taken orally about **30 minutes to 1 hour** before sexual activity, preferably on an empty stomach, because food may delay the effect of the drug. The dose should not exceed **100 mg** within 24 hours.

- **Maximum dose**: To avoid side effects, it is recommended to take it no more than once every 24 hours.

- **Treatment of pulmonary arterial hypertension (PAH): For patients treating pulmonary arterial hypertension, the usual dose is **20 mg** three times a day. The specific dose should be adjusted according to the doctor's advice.

### 4. **Precautions**

- **Drug interactions**: Sildenafil may have dangerous interactions with some drugs (such as nitrates), causing a sudden drop in blood pressure. Therefore, people who are taking these drugs should not use sildenafil.

- **Side effects**: Common side effects include headache, facial flushing, indigestion, blurred vision, etc. Individual patients may experience more serious side effects such as deafness, heart problems, etc. If emergency symptoms such as chest pain, difficulty breathing, prolonged erection (more than 4 hours) occur, seek medical attention immediately.

- **Contraindications**: Patients who are allergic to sildenafil or its ingredients, or patients who are taking drugs containing nitrates should avoid use.

### 5. **Use of sildenafil raw powder**

Sildenafil raw powder is mainly used in the production process of pharmaceutical companies and preparation factories, or in some situations where homemade drugs are required. For individuals, unless under the guidance of a doctor, it is not recommended to purchase raw powder and mix it for use, because the dosage is difficult to control and there may be safety hazards.

Viagra (Sildenafil citrate) is a widely used drug that was originally used to treat male erectile dysfunction (ED), but its uses and effects go far beyond that. As a pharmacologically active substance, sildenafil mainly works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5), thereby enhancing vasodilation, increasing blood flow to the penile area, and thus improving erectile function. Sildenafil raw powder is often used in drug production and has a wide range of potential benefits in different fields. Here are some important benefits of sildenafil raw powder:

### 1. **Treatment of erectile dysfunction (ED)**

The most well-known use of sildenafil is to treat male erectile dysfunction. It relaxes smooth muscles, dilates blood vessels, increases blood flow to the penile area, and helps men get and maintain erections by inhibiting the PDE5 enzyme and enhancing the effects of nitric oxide (NO).

- **Improves blood flow**: Sildenafil enhances vasodilation, improves local blood flow, and relieves erectile difficulties caused by poor blood flow.

- **Enhanced sexual function**: By improving blood flow, sildenafil makes it easier for men to get and maintain an erection when sexually stimulated, thereby improving the quality of their sex life.

### 2. **Treatment of pulmonary arterial hypertension (PAH)**

Sildenafil is also used to treat pulmonary arterial hypertension (PAH), a disease that affects the blood vessels in the lungs, causing the heart to work harder. Sildenafil works by dilating the blood vessels in the lungs to reduce pressure in the pulmonary arteries and improve blood flow.

- **Reduced pulmonary artery pressure**: Sildenafil can significantly reduce pressure in the pulmonary arteries, improve oxygen delivery, and help relieve shortness of breath.

- **Improved exercise endurance**: In people with PAH, sildenafil helps improve exercise capacity and quality of life.

### 3. **Improved exercise performance**

Studies have shown that sildenafil may help improve exercise performance, especially in people with certain health conditions, such as exercise-induced altitude sickness or certain cardiopulmonary problems.

- **Improve oxygen delivery efficiency**: Sildenafil dilates blood vessels and enhances the delivery of oxygen and nutrients, which may help athletes deliver oxygen to muscles more efficiently during high-intensity exercise, thereby improving athletic performance.

- **Altitude sickness relief**: At high altitudes, due to the thin oxygen supply, sildenafil may help relieve altitude sickness by improving blood oxygen supply.

### 4. **Improve heart health**

Sildenafil has certain benefits for the cardiovascular system, especially for the treatment of certain cardiovascular diseases.

- **Enhance vascular function**: Sildenafil's vasodilation effect helps reduce the workload of the heart, especially for the elderly or people with cardiovascular problems.

- **May fight heart failure**: Some studies have shown that sildenafil can improve symptoms in patients with mild heart failure and improve the diastolic function of the heart.

### 5. **Antidepressant effect (potential research direction)**

Although sildenafil was originally developed for the treatment of erectile dysfunction, some studies have found that it may have an indirect improvement effect on patients with depression. By improving blood flow and increasing oxygen supply to brain areas, sildenafil may help relieve mental state problems caused by poor blood circulation.

- **Improving mental health**: By improving physiological conditions, sildenafil may indirectly relieve some psychological stress, anxiety, and depression caused by physical discomfort (such as ED).

### 6. **Promoting endocrine health**

Sildenafil also has potential positive effects in certain endocrine problems. For example, sildenafil may have an impact on improving some male hormone levels or health problems related to sex hormones.

### 7. **Other potential benefits**

Some animal experiments and clinical studies have shown that sildenafil may have other potential benefits, although research in these areas is still ongoing.

- **Antitumor effects**: Preliminary studies have shown that sildenafil may play an auxiliary role in the treatment of certain types of cancer, helping to improve the blood supply to tumors, thereby affecting the growth of cancer cells.

- **Neuroprotective effects**: Sildenafil is being studied for the treatment of certain neurodegenerative diseases (such as Alzheimer's disease), and preliminary results show that it may have certain neuroprotective effects.

### Precautions for use:

- **Side effects**: Although sildenafil has positive effects in treating a variety of diseases, it may also cause some side effects, such as headaches, facial flushing, stomach discomfort, blurred vision, etc. Long-term use may affect the cardiovascular system, especially for people with existing heart problems should be used with caution.

- **Interaction with other drugs**: Sildenafil interacts with certain drugs (such as nitrate drugs, certain antibiotics), so a doctor should be consulted before use.

### Summary:

Sildenafil (Viagra) is not only a classic drug for the treatment of erectile dysfunction, but also shows potential benefits in many other health areas. From improving blood flow and relieving pulmonary hypertension to improving athletic performance and promoting cardiovascular health, the scope of application of sildenafil is constantly expanding. However, despite the many potential health benefits of sildenafil, any decision to use this drug should be made under the guidance of a doctor to ensure safety and effectiveness.

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