Use the injection exactly as directed by your family doctor . Do not use more of it and do not use it more often than ordered. If too much is using, the erection may become so strong that it lasts too long and does not reverse when it must. This condition is called priapism and it can be very dangerous. If the effect is not reversed, the blood supply to the penis may be cut off and permanent damage may occur.
Contact your family doctor immediately if the erection lasts for longer than 4 hours or if it becomes painful . This may be a sign of priapism and must be treated right away to prevent permanent damage.
If you notice bleeding at the site when you inject the drug, put pressure on the spot until the bleeding stops. If it doesn't stop, check with your family doctor.
It is important for you to examine your penis regularly. Check with your family doctor if you find a lump where the drug has been injected or if you notice that your penis is becoming curved. These may be signs that unwanted tissue is growing - called fibrosis, which must be seen by your family doctor.