两性健康

Viagra 100mg (Sildenafil Citrate): A Comprehensive Overview

Posted on by 威而钢（伟哥）

Viagra 100mg, known by its brand name 万艾可 (Viagra)​ and commonly referred to as 伟哥 (Weige), is the original prescription medication for treating male erectile dysfunction (ED) . Its active ingredient is Sildenafil Citrate (枸橼酸西地那非), a selective phosphodiesterase type 5 (PDE5) inhibitor . Approved by the U.S. FDA in 1998, it revolutionized ED treatment . It is crucial to understand that this is a prescription medication​ and should only be used under the strict guidance of a qualified healthcare professional after a thorough medical evaluation .

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Viagra 100mg，品牌名万艾可 (Viagra)，俗称伟哥，是用于治疗男性勃起功能障碍的原创处方药物。其活性成分为枸橼酸西地那非，是一种选择性磷酸二酯酶5型抑制剂。于1998年获美国FDA批准，彻底改变了勃起功能障碍的治疗。必须理解，这是一种处方药物，应仅在全面医学评估后，由合格医疗专业人员的严格指导下使用。

1. Composition and Mechanism of Action / 成分与作用机制

  • Active Ingredient:​ Sildenafil Citrate (枸橼酸西地那非)​ 100mg per tablet .
  • Drug Class:​ Selective phosphodiesterase type 5 (PDE5) inhibitor .
  • Mechanism:​ It works by inhibiting the PDE5 enzyme in the penile tissues . This inhibition increases the level of cyclic guanosine monophosphate (cGMP), leading to relaxation of smooth muscles and dilation of blood vessels. This significantly increases blood flow to the penis during sexual stimulation, facilitating the achievement and maintenance of an erection . It is important to note that it does not​ directly cause an erection without stimulation .
  • 活性成分：​ 枸橼酸西地那非，每片100毫克。
  • 药物类别：​ 选择性磷酸二酯酶5型抑制剂。
  • 作用机制：​ 通过抑制阴茎组织中的PDE5酶发挥作用。这种抑制会增加环磷酸鸟苷的水平，导致平滑肌松弛和血管扩张。从而在性刺激期间显著增加流向阴茎的血流量，促进勃起的实现和维持。重要的是，没有性刺激时，它不会直接引起勃起。

2. Effects / 效果

When taken as directed, Viagra 100mg aims to treat erectile dysfunction:

  • For ED:​ Helps in achieving and maintaining an erection with sexual stimulation​ . It is not​ an aphrodisiac and does not increase libido .
  • Onset Time:​ Effects typically begin within 30 minutes to 1 hour​ after ingestion, but can be taken anywhere from 30 minutes to 4 hours​ before sexual activity .
  • Duration:​ The therapeutic window for achieving an erection with stimulation is typically several hours.
  • Efficacy:​ Clinical studies show significant improvement in erectile function for various causes of ED, including psychological, organic (e.g., diabetes, hypertension), and medication-induced .

按指示服用时，Viagra 100mg旨在治疗勃起功能障碍：

  • 针对勃起功能障碍：​ 在性刺激下，有助于实现并维持勃起。它不是春药，也不会提高性欲。
  • 起效时间：​ 通常在服用后30分钟至1小时内起效，但可在性活动前30分钟至4小时内的任何时间服用。
  • 持续时间：​ 在性刺激下获得勃起的治疗窗口期通常为数小时。
  • 有效性：​ 临床研究表明，对于各种原因引起的勃起功能障碍，包括心理性、器质性（如糖尿病、高血压）和药物引起的，均有显著改善。

3. Suitable User Groups / 适用人群

  • Adult men diagnosed with erectile dysfunction (ED)​ due to various causes .
  • Important:​ This medication is only​ for adult males. It is not​ indicated for use by women, children, adolescents under 18, or men for whom sexual activity is not advised due to cardiovascular risk​ .
  • It should only be used after a medical evaluation to confirm the diagnosis of ED and rule out contraindications.
  • 经诊断因各种原因患有勃起功能障碍的成年男性。
  • 重要提示：​ 此药物仅适用于成年男性。不适用于女性、儿童、18岁以下青少年，或因心血管风险不建议进行性活动的男性。
  • 应在医学评估后使用，以确认勃起功能障碍诊断并排除禁忌症。

4. Contraindications (Who Should NOT Use) / 禁忌症（不应使用者）

ABSOLUTE CONTRANDICATIONS:

  • Patients allergic to Sildenafil or any component of the medication .
  • Patients currently taking any form of nitrates​ (e.g., nitroglycerin for angina) or nitric oxide donors. Concurrent use can cause a severe, life-threatening drop in blood pressure​ .
  • Patients with severe cardiovascular diseases (e.g., unstable angina, recent myocardial infarction, stroke, severe heart failure, life-threatening arrhythmias) where sexual activity is inadvisable .
  • This medicine is not for use by women or children​ .

RELATIVE CONTRANDICATIONS / USE WITH EXTREME CAUTION (Consult Doctor):

  • Patients with a history of non-arteritic anterior ischemic optic neuropathy (NAION) or sudden hearing loss .
  • Patients with severe hepatic (liver) impairment (Child-Pugh Class C) or severe renal (kidney) impairment. A starting dose of 25mg should be considered .
  • Patients with anatomical deformation of the penis (e.g., Peyronie’s disease), conditions predisposing to priapism (e.g., sickle cell anemia, leukemia), or active peptic ulcer .
  • Patients with uncontrolled hypertension or hypotension .
  • Patients taking other medications, especially alpha-blockers or strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir) .

绝对禁忌症：

  • 对西地那非或本品任何成分过敏的患者。
  • 目前正在服用任何形式硝酸盐（例如，用于治疗心绞痛的硝酸甘油）或一氧化氮供体的患者。同时使用可能导致严重、危及生命的血压下降。
  • 患有严重心血管疾病（例如，不稳定型心绞痛、近期心肌梗塞、中风、严重心力衰竭、危及生命的心律失常）且不建议进行性活动的患者。
  • 此药不适用于女性或儿童。

相对禁忌症 / 极度谨慎使用（需咨询医生）：

  • 有非动脉炎性前部缺血性视神经病变或突发性听力丧失病史的患者。
  • 患有严重肝功能损害（Child-Pugh C级）或严重肾功能损害的患者。应考虑从25毫克起始剂量开始。
  • 阴茎解剖结构异常（例如，佩罗尼病）、有阴茎异常勃起倾向（例如，镰状细胞性贫血、白血病）或活动性消化性溃疡的患者。
  • 患有未受控制的高血压或低血压的患者。
  • 正在服用其他药物的患者，特别是α-受体阻滞剂或强效CYP3A4抑制剂（例如，酮康唑、利托那韦）。

5. Dosage and Administration / 用法用量

  • It is imperative to follow a doctor’s prescription.​ Self-medication is dangerous.
  • Standard Regimen:
    • The recommended starting dose for most patients is 50mg, taken as needed approximately 1 hour before sexual activity​ .
    • Based on effectiveness and tolerability, the dose may be increased to a maximum of 100mg or decreased to 25mg​ .
    • Do not take more than once in 24 hours​ . The maximum recommended dosing frequency is once per day .
  • For Special Populations (e.g., elderly over 65, patients with hepatic impairment):​ A starting dose of 25mg​ should be considered .
  • Administration:​ Swallow the tablet whole with water. Take on an empty stomach or with a light meal​ for optimal absorption. Avoid high-fat meals​ as they can significantly delay absorption and reduce efficacy .
  • Note:​ The drug requires sexual stimulation​ to work. Taking it without stimulation will not produce an erection .
  • 必须遵循医生的处方。​ 自行用药是危险的。
  • 标准方案：
    • 对于大多数患者，推荐的起始剂量为50毫克，按需在性活动前约1小时服用。
    • 根据疗效和耐受性，剂量可增加至最大100毫克或减少至25毫克。
    • 24小时内不得超过一次。最大推荐用药频率为每日一次。
  • 针对特殊人群（例如，65岁以上老年人、肝功能损害患者）：​ 应考虑25毫克的起始剂量。
  • 服用方法：​ 用水整片吞服。空腹或与清淡餐食同服以获得最佳吸收。避免高脂肪餐，因为它们会显著延迟吸收并降低疗效。
  • 注意：​ 该药物需要性刺激才能起作用。没有刺激时服用不会产生勃起。

6. Precautions and Potential Side Effects / 注意事项与潜在副作用

  • Common Side Effects (Usually mild to moderate and transient):​ Include headache, flushing (redness of the face), dyspepsia (indigestion), nasal congestion, abnormal vision (e.g., blurred vision, blue tinge), back pain, myalgia (muscle aches), nausea, dizziness, and rash​ . These often resolve on their own .
  • Serious Side Effects (Require immediate medical attention):
    • Priapism:​ An erection lasting more than 4 hours, which can damage penile tissue and lead to permanent erectile dysfunction if not treated urgently .
    • Sudden vision loss or hearing loss:​ Report any sudden decrease or loss of vision in one or both eyes, or sudden hearing impairment .
    • Cardiovascular events:​ Symptoms such as chest pain, palpitations, or fainting may indicate a serious heart problem .
    • Severe allergic reactions:​ Symptoms like hives, difficulty breathing, swelling of the face/lips/tongue/throat .
  • Drug Interactions:​ Absolutely avoid concurrent use with nitrates.​ Inform your doctor about all​ medications and supplements you are taking. Be cautious with alpha-blockers and strong CYP3A4 inhibitors/inducers .
  • Alcohol and Grapefruit:​ Limit alcohol consumption as it may increase the risk of dizziness and low blood pressure . Avoid grapefruit or grapefruit juice .
  • Storage:​ Store at room temperature, in a dry place, away from light and moisture. Keep out of reach of children .
  • 常见副作用（通常为轻至中度且短暂）：​ 包括头痛、面部潮红、消化不良、鼻塞、视力异常（如视力模糊、蓝色调）、背痛、肌肉酸痛、恶心、头晕和皮疹。这些症状通常会自行缓解。
  • 严重副作用（需立即就医）：
    • 阴茎异常勃起：​ 勃起持续超过4小时，如果不紧急治疗，可能会损伤阴茎组织并导致永久性勃起功能障碍。
    • 突发性视力丧失或听力丧失：​ 报告任何单眼或双眼视力突然下降或丧失，或突发性听力障碍。
    • 心血管事件：​ 胸痛、心悸或昏厥等症状可能表明严重的心脏问题。
    • 严重过敏反应：​ 荨麻疹、呼吸困难、面部/嘴唇/舌头/喉咙肿胀等症状。
  • 药物相互作用：​ 绝对避免与硝酸盐类药物同时使用。​ 告知医生您正在服用的所有药物和补充剂。与α-受体阻滞剂和强效CYP3A4抑制剂/诱导剂合用时需谨慎。
  • 酒精和葡萄柚：​ 限制饮酒，因为它可能增加头晕和低血压的风险。避免葡萄柚或葡萄柚汁。
  • 储存：​ 室温保存，置于干燥处，避光防潮。请放在儿童接触不到的地方。

Conclusion / 结论

Viagra 100mg (Sildenafil Citrate) is the pioneering and well-established prescription medication for the treatment of male erectile dysfunction. Its mechanism of action is clear, and its efficacy is supported by extensive clinical use. However, it is a potent medication with significant risks and is absolutely contraindicated​ for individuals taking nitrates or with certain serious cardiovascular conditions. It is a prescription medication meant for as-needed​ use and must be initiated under medical supervision after a proper health assessment. It is not a recreational drug or an aphrodisiac.​ Self-medication, obtaining it from unofficial sources, or ignoring contraindications can lead to serious, even life-threatening, health consequences. For safe and effective management of ED, consulting a healthcare professional for a personalized diagnosis and treatment plan is imperative.

Viagra 100mg（枸橼酸西地那非）是治疗男性勃起功能障碍的开创性且成熟的处方药物。其作用机制明确，疗效得到广泛临床使用的支持。然而，这是一种强效药物，具有显著风险，对于正在服用硝酸盐类药物或患有某些严重心血管疾病的个体是绝对禁忌的。这是一种按需使用的处方药物，必须在适当的健康评估后，在医疗监督下开始使用。它不是娱乐性药物或春药。​ 自行用药、从非官方渠道获取或忽视禁忌症都可能导致严重甚至危及生命的健康后果。为了安全有效地管理勃起功能障碍，咨询医疗专业人士以获得个性化的诊断和治疗方案至关重要。