A list of the five types of Viagra hardness explains in detail the efficacy, duration and key precautions

　　It must be emphasized that all such prescription drugs must be prescribed according to individual circumstances after a comprehensive diagnosis by a doctor, and must not be purchased or abused by oneself. This article aims to provide an objective popular science introduction to help readers establish a correct understanding, but it can never replace the diagnosis and treatment suggestions of professional doctors.

　　1. Core Comparison: Characteristic Analysis of Five Common PDE5 Inhibitors

　　What we often call "Viagra" in medicine refers to Phosphodiesterase type 5 (PDE5) inhibitors . They help achieve and maintain an erection during sexual stimulation by relaxing vascular smooth muscle and increasing blood flow to the corpus cavernosum of the penis. Below is a comparison of key information about five common medications. Please note: “The "hardness" effect mainly depends on the individual's response to the drug and sufficient sexual stimulation, rather than the type of drug itself that determines the absolute hardness level.。

　　1. Sildenafil (commonly known as "Viagra", "Viagra")

　　Features : The earliest PDE5 inhibitor on the market, with a long application history and rich doctor experience.

　　Onset of effect : Approx. required 30-60 minutes . The effect is better when taken on an empty stomach.

　　Duration of action : The effective action time is usually 4-6 hours。

　　Things to note : A high-fat diet will significantly delay its absorption and onset of action. Some people may experience side effects such as facial flushing, headache, and visual abnormalities (such as seeing things with a bluish tint).

　　2. Tadalafil (commonly known as "Cialis")

　　Features : The biggest advantage is Long lasting。

　　Onset of effect : Approx. required 30-60 minutes。

　　Duration of action : The effective action time can be as long as about 36 hours . Therefore, it is known as the "weekend pill", which provides greater time flexibility and reduces the stress caused by "planning". There are also low-dose once-daily treatment options.

　　Things to note : Because of its long duration of action, side effects (such as headache, back pain, muscle soreness) may also last relatively long.

　　3. Vardenafil (commonly known as “Levitra”)

　　Features : Rapid onset of action, relatively low incidence of side effects.

　　Onset of effect :about 25-60 minutes。

　　Duration of action : The effective action time is approximately 4-5 hours。

　　Things to note : Its absorption is less affected by food. Effective and tolerable.

　　4. Avanafil

　　Features : It is a newer drug, focusing on Rapid onset of action and rapid metabolism。

　　Onset of effect : The fastest available is approx. within 15 minutes Take effect.

　　Duration of action : The effective action time is relatively short, about 6 hours。

　　Things to note : Because of its rapid metabolism, side effects may be milder and shorter-lasting for some patients.

　　5. Mironafil (a new PDE5 inhibitor, available in some regions)

　　Features : As a new generation of drugs, its research data are also constantly accumulating.

　　Onset and duration : The onset time and duration of action are similar to those of the aforementioned drugs, but there may be slight differences in the mechanism of action and side effect spectrum.

　　Things to note : Be sure to use it under the guidance of a doctor, and pay attention to the latest clinical Usage Information.

　　Core tips : There is no "best" drug, only the "most suitable" one. The choice depends on individual lifestyle, efficacy requirements, medical condition (particularly cardiovascular condition and concomitant medications), and tolerance for side effects.

　　2. Scientific understanding: The causes of ED and the working principle of PDE5 inhibitors

　　The prerequisite for correct medication is understanding disease and the fundamentals of medicine.

　　Common causes of erectile dysfunction (ED)：

　　ED rarely is solely psychological. It often involves physical factors:

　　Vascular factors :hypertension, Hyperlipidemia , diabetes, etc. that damage blood vessel function are the most common causes of ED.

　　nerve factor : Diabetes, pelvic surgery, spinal cord injury, etc. affect nerve conduction.

　　endocrine factors : Low androgen levels.

　　psychological factors : Anxiety, depression, stress, relationship issues.

　　Drugs and Lifestyle Habits : Certain drugs (such as some antihypertensive drugs), smoking, alcoholism, and obesity.

　　How PDE5 inhibitors work：

　　Under sexual stimulation, nerve terminals release nitric oxide (NO), which promotes the synthesis of cyclic guanosine monophosphate (cGMP) in cells. The function of cGMP is to relax the smooth muscles of the corpus cavernosum to allow blood to flow in. The enzyme PDE5 breaks down cGMP. The role of PDE5 inhibitors is Inhibit PDE5 enzyme , thereby increasing the concentration of cGMP, enhancing and maintaining the erectile response. Therefore, taking the pill alone is ineffective without sexual stimulation.

　　3. Safety first: absolute guidelines for medication use and healthy lifestyle

　　When using this type of medication, safety must be your top priority.

　　1. Medical red lines that must be observed

　　absolute prescription drug : Must be prescribed by a doctor after ED is diagnosed. Your doctor will need to evaluate whether your cardiovascular health allows you to have sex safely and rule out other causes.

　　Contraindications warning：It must not be combined with any form of nitrate drugs (such as nitroglycerin, isosorbide mononitrate, etc., commonly used to treat angina pectoris) , otherwise life-threatening severe hypotension may result. It is also contraindicated in patients with recent stroke, myocardial infarction, severe hypotension or heart failure.

　　Be aware of drug interactions : You need to tell your doctor about all the medications you are taking, especially alpha-blockers (for prostate enlargement or blood pressure), certain antibiotics, antifungals, etc., because they may affect drug metabolism.

　　2. Correct treatment and treatment of side effects

　　Common side effects include headache, facial flushing, indigestion, nasal congestion, dizziness, etc., which are usually mild and short-lived. If you experience sudden hearing or vision loss or priapism (persistent painful erection of the penis) lasting more than 4 hours, The medication must be stopped immediately and seek urgent medical attention。

　　3. The root cause: improving overall health

　　Drugs are "accelerants", not "engines". The root of improving ED lies in treating underlying diseases and living a healthy life:

　　Active management is slow sexually transmitted diseases : Strictly control blood sugar, blood pressure, and blood lipids.

　　Completely quit smoking and limit alcohol consumption。

　　Maintain regular exercise : Especially aerobic exercise, improves vascular function.

　　maintain a healthy weight。

　　Manage psychological stress : Seek psychological counseling if necessary.

　　Get enough sleep。