Hi, Thanks for posting in HCM. I understand your concern. Caverta 100 is composed of Sildenafil citrate . It is used in the treatment for Erectile Dysfunction in men regardless of the cause or duration of the problem or the age of the patient. The most common side effects of Caverta are headache, flushing of the face and upset stomach. Less common side effects that may occur are temporary changes in colour vision, eyes being more sensitive to light or blurred vision. However, these effects are usually mild to moderate and usually don t last longer than a few hours. In case this drug is causing such side effects, you can try Tadalafil or Vardenafil, which are more specific and has less side effects. Also, it would be advisable for you to try natural methods to get good erection and sustain it longer by practising behavioural techniques like pause and squeeze technique. Inclusion in your diet - almonds, banana, pineapple, saffron, cardamom, figs, honey and pumpkin, which are known to increase the blood flow to the penis and help to initiate and sustain erection, would also be helpful. Hope the information provided would be helpful. All the best.