In my case viagra labored about 25% of the time. This time interval is called the ejaculatory latency. This is understood because the refractory interval. So, if you're experiencing headaches and you use a excessive dose of ED treatment, resembling 100mg of Viagra, 20mg of Cialis or 20mg of Levitra, then you may want to consider a lower dose. Most of these headaches are mild, however, Viagra can induce the onset of migraines in a small minority of users. Whilst most ED medications are simpler when taken on an empty stomach, taking them with out meals may additionally enhance your possibilities of getting a headache from the medicine. Alcohol can increase the probabilities of experiencing certain side effects, mainly complications. If you are experiencing complications after utilizing Cialis or Levitra, speak to your doctor about other ED options. Finally, there are considerations that PDE5 inhibitors might increase the danger of neonatal mortality in pregnant women, and trials investigating use of the medication for fetal development restriction have been suspended. Avoid driving or operating hazardous equipment until you understand how the medications have an effect on you, and use warning when getting up from a sitting or lying place.