Although not everyone has adverse effects, Kamagra Oral Jelly Australia can cause them like any medication. The documented negative effects of using sildenafil or Kamagra jelly, however, are often minor and transient. Sildenafil or Kamagra should not be taken if you develop any of the following severe side effects; instead, stop using them and get help straight away. An allergic response Sudden wheezing, difficulty breathing, lightheadedness, and enlargement of the eyelids, face, lips, or neck are some symptoms. Chest discomfort: This is unusual. You should maintain a semi-seated position and make an effort to relax if chest pain develops during or after sexual activity. Nitrates must never be used to relieve chest discomfort.