Phenacetin Raws Powder CAS：62-44-2

**Phenacetin** (chemical name: N-(4-ethoxyphenyl)acetamide) is an organic compound that belongs to the category of nonsteroidal anti-inflammatory drugs (NSAIDs) and antipyretic analgesics. It was once widely used to relieve pain and reduce fever, but its use has been banned or restricted in many countries due to its potential health risks.

### Physical and chemical properties

1. **Molecular formula**: C₁₀H₁₃N₃O₂

2. **Molecular weight**: 179.22 g/mol

3. **Appearance**: Phenacetin is usually a white or off-white crystalline powder.

4. **Solubility**: It is poorly soluble in water, but soluble in alcohols, ethers and other organic solvents.

5. **Melting point**: About 134-136°C (273-277°F).

6. **pH**: The pH value of the solution in water is about 6-7.

### Main Functions and Uses

Phenacetin is mainly used as an antipyretic analgesic to relieve mild to moderate pain, such as headache, toothache, joint pain, etc., and can be used to reduce fever. However, due to its potential toxicity to the kidneys and interactions with other drugs, many countries no longer recommend its use.

### Dosage and Use

- **Adult Dosage**: The usual dose is 500 mg to 1 gram, which can be taken 3 to 4 times a day. The specific dose needs to be adjusted according to the doctor's advice and individual situation.

- **Children's Dosage**: It is not recommended for use in children because of its large side effects.

### Half-Life and Pharmacokinetics

1. **Half-Life**: The half-life of phenacetin is about 2 to 3 hours, and the specific time varies from individual to individual.

2. **Metabolism**: It is metabolized into active metabolites in the liver, such as paracetamol/Acetaminophen, which is also a widely used antipyretic analgesic.

3. **Excretion**: Most of it is excreted through the kidneys in the form of metabolites, and a small amount is excreted in the form of the original drug.

### Risks and Side Effects

Although Phenacetin has been widely used in the past, its potential side effects and health risks have attracted attention:

1. **Nephrotoxicity**: Long-term use can cause kidney damage and increase the risk of kidney disease.

2. **Cancer Risk**: Studies have shown that long-term use of Phenacetin is associated with an increased risk of certain cancers (such as bladder cancer).

3. **Allergic reactions**: May cause allergic reactions such as rashes and itching.

4. **Gastrointestinal discomfort**: Including nausea, vomiting, and stomach pain.

### Conclusion

Phenacetin is a long-standing antipyretic analgesic. Despite its high effectiveness, many countries have banned or restricted its use due to potential serious side effects and health risks. Currently, when patients seek pain relief or fever reduction treatment, they should consider using other safer alternatives and use them rationally under the guidance of a doctor.

**Phenacetin (phenylacetamide)** is an over-the-counter drug that was once widely used for pain relief and fever reduction. Although it has been banned in many countries and regions, it may still exist in some places. The following is a detailed introduction to the applicable population, working principle, and usage and dosage of Phenacetin.

### Applicable population

Phenacetin is mainly suitable for the following groups:

1. **Adults and adolescents**: used to relieve mild to moderate pain, such as headaches, toothaches, muscle pain, and joint pain.

2. **Fever patients**: used to reduce fever caused by colds, flu, etc.

3. **Postoperative patients**: sometimes used for postoperative pain management.

### Working principle

The main working principle of Phenacetin is as follows:

1. **Analgesic effect**: Phenacetin reduces the transmission of pain signals by inhibiting the synthesis of certain chemicals in the body (such as prostaglandins), thereby achieving the effect of relieving pain.

2. **Antipyretic effect**: It promotes the reduction of body temperature by acting on the temperature regulation center of the hypothalamus.

### Dosage and Administration

The dosage of Phenacetin is generally as follows:

- **Adults**: The recommended dose is usually 500 mg to 1000 mg, once every 4 to 6 hours, not exceeding 4000 mg in 24 hours.

- **Children**: The dosage needs to be adjusted according to body weight and doctor's advice, usually 10 mg/kg, but the specific dosage should be consulted with a doctor.

### Precautions

- **Allergic reactions**: People who are allergic to Phenacetin or its ingredients should avoid use.

- **Liver damage**: Long-term or high-dose use may cause liver damage.

- **Interaction with other drugs**: Phenacetin may interact with other drugs, and a doctor or pharmacist should be consulted before use.

### Conclusion

Although Phenacetin has been widely used in the past, it has been banned or restricted in many places due to its potential side effects and health risks. When considering use, you should consult a medical professional and read the instructions carefully.

Phenacetin (phenylacetamide) is an over-the-counter analgesic and antipyretic that was once widely used in medicine, although its use is now banned or restricted in many countries. Despite this, it is still useful to understand its historical background and potential benefits. Here are some of the benefits, uses, and precautions of Phenacetin:

### 1. **Analgesic effect**

Phenacetin is used to relieve mild to moderate pain, such as headaches, toothaches, and joint pain. It reduces pain sensation by inhibiting the synthesis of prostaglandins. Prostaglandins are chemicals associated with pain and inflammation, so Phenacetin's analgesic effect made it popular in its past use.

### 2. **Antipyretic effect**

Phenacetin has fever-reducing properties, so it is often used to treat fever-related illnesses, such as the flu or cold. It effectively lowers body temperature and makes patients feel more comfortable when they have a fever.

### 3. **Relatively mild side effects**

Compared to some other nonsteroidal anti-inflammatory drugs (NSAIDs), Phenacetin has relatively few side effects, especially when used in the short term. Many patients do not experience serious gastrointestinal side effects, such as ulcers or bleeding, when using Phenacetin, which makes it considered a safer option in some cases.

### 4. **Composition of drug formulations**

In the pharmaceutical industry, Phenacetin was once an important ingredient in some compound painkillers. It is often used in combination with other drugs (such as caffeine, aspirin, etc.) to enhance the pain relief effect. This combination can produce a synergistic effect and improve the overall efficacy.

### 5. **Special effects on certain types of pain**

Phenacetin may be effective in the management of certain specific types of pain, especially pain related to muscles and bones. Its relief effect may be particularly beneficial for athletes or people who engage in physical labor.

### 6. **Historical background and research**

Although Phenacetin was widely used in the early to mid-20th century, many countries have restricted or banned its use as awareness of its potential health risks (such as kidney damage and carcinogenicity) has increased. Despite this, the relevant research and data still provide valuable perspectives for understanding the potential benefits and risks of the drug.

### 7. **Alternative treatments**

In some countries, although the use of phenacetin itself is restricted, its pharmacological properties provide a reference for the search for other safe and effective analgesics. Medical researchers have been exploring new compounds with similar mechanisms of action to replace phenacetin.

### **Precautions**

Although phenacetin was once widely used, many medical organizations no longer recommend its use due to its association with kidney damage and other health problems. For patients who need analgesic or antipyretic treatment, they should consult a doctor and consider other safer alternatives, such as acetaminophen (such as paracetamol) or nonsteroidal anti-inflammatory drugs.

Overall, although phenacetin has some historical benefits, its use in modern medicine should be treated with caution, emphasizing the need for treatment under the guidance of professional medical personnel.

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