How long does it take for Viagra to work? This is one of the most common concerns among ED patients. Viagra is a generic term for PDE-5 inhibitors, a broad class of medications. Currently, there are four types of "Viagra" available on the market: sildenafil, tadalafil, vardenafil, and avanafil. When discussing how long it takes for Viagra to take effect, it depends not only on the time of ingestion but also on the specific type of Viagra being used.
The first-generation product, sildenafil citrate, typically takes effect within 30 to 60 minutes, improving erectile function. The well-known "Viagra" brand, Viagra, primarily contains sildenafil citrate. It should be taken 1 to 3 hours before sexual activity.It's important to note that sildenafil may cause side effects such as headaches, facial flushing, and indigestion. Individuals with low tolerance to sildenafil should minimize its use.
Second-generation tadalafil offers significantly improved duration of effect. As the only long-acting inhibitor approved by both the U.S. FDA and China's CFDA, pharmacologic studies show its effects last up to 36 hours. Most men experience onset within 25 minutes after use. The representative product is Cialis.It is best taken half an hour before sexual activity. However, this product cannot be purchased over-the-counter and requires a doctor's prescription.
The third-generation product, vardenafil, has a similar onset time to tadalafil. Its effect lasts longer than sildenafil but shorter than tadalafil, making it a medium-acting PDE-5 inhibitor. The commonly known brand Cialis is vardenafil.However, note that vardenafil has a mild hypotensive effect. Concurrent use with other medications or alcohol can significantly lower blood pressure, potentially causing orthostatic hypotension or fainting. Additionally, high-fat meals may impair absorption, so vardenafil is best taken on an empty stomach.
The fourth-generation product is avanafil. Compared to the previous three generations, avanafil's greatest advantage is its rapid onset. The order of onset speed is: avanafil > tadalafil > vardenafil > sildenafil. Although avanafil's instructions state that patients should take it 30 minutes before sexual activity,However, studies show avanafil is rapidly absorbed and has been demonstrated to take effect in as little as 10 minutes—significantly faster than the 30-60 minutes reported for other medications—greatly reducing waiting time. While food affects the pharmacokinetics of sildenafil and vardenafil, it does not impact avanafil. Furthermore, avanafil remains unaffected by moderate alcohol consumption.Simultaneously, avanafil demonstrates exceptional safety. This product exhibits higher selectivity for PDE-5, resulting in a significantly lower incidence and severity of adverse reactions compared to previous generations. Avanafil's rapid onset allows ED patients to enjoy sexual activity spontaneously without premature administration, while also presenting fewer side effects. Consequently, it has gained widespread popularity among ED patients both domestically and internationally.
Haisco Avanafil received marketing approval in March this year. Developed by Haisco Pharmaceutical Group, it is China's first approved avanafil product for ED treatment.Haisco Group possesses robust technical capabilities, backed by a professional R&D team with solid theoretical foundations, extensive experience, and outstanding innovation. Multiple drugs developed by the group have been included in the National Medical Insurance Directory. Its products cover over 70% of Grade A tertiary hospitals nationwide and have established high professional brand recognition among domestic clinicians and patients.
Consequently, many expressed great anticipation upon hearing the news of Haichi Avanafil's imminent market launch.