Viagra is also known as sildenafil citrate. The main difference between sublingual tablets of apomorphine hydrochloride and sildenafil citrate is that they are taken in different ways, with different speeds of effect, and different symptoms of adverse reactions that are likely to occur. Apomorphine hydrochloride sublingual tablets are mainly placed under the tongue 20 minutes before sexual intercourse, and the effect can be seen in about 15-20 minutes. The medication is not effective if swallowed, and it is advisable to drink a small amount of water before using the medication. Sildenafil citrate can be taken orally about 0.5~4 hours before sexual intercourse, it takes effect in 30~120 minutes and the effect of the drug usually lasts for about 4 hours. Apomorphine Hydrochloride Sublingual Tablets have mild transient adverse effects, which may include dizziness, pharyngitis, worsening cough, arthritis, and abnormal taste. More common adverse reactions to sildenafil citrate are skin flushing, indigestion, abnormal vision, back pain, and rash. The main differences between Apomorphine Hydrochloride Sublingual Tablets and Sildenafil Citrate can be understood by consulting with a relevant medical professional or consulting specialized knowledge. The drug should be applied under medical supervision.