Penile Injection Therapy Side Effects and Risks Discoloration Redness of the penis Priapism Prolonged erection Headache Dizziness Pain Back pain. Infection Penile Abscess. Rash Rash on the skin of your penis. Itching Itching/warmth/numbness of your penis. Vision Vision problems. Cough Cough Breath Problem Stuffy nose. Cold Cold symptoms, or Flu symptoms. Bleeding or Bruising Bleeding or bruising at the site of medication administration, unusual discharge from the penis, pain in the groin/penis/urethra/testicles/legs. Expensive Cost of Caverject, Caverject Impulse, TryMix and Edex with average retail prices over $200 for two doses. BUY NOW