Medical experts like Doctor Barry Allen, who have been doing research on the male erectile dysfunction to make the treatment effective , recommend Viagra 100 mg to overcome higher to severe cases of erectile dysfunction . Dr. Allen remarks that this higher dose is highly effective to bring desired result to males who have been dissatisfied with the lower doses. But he cautions that never use this without a medical consultations. 100 mg is a higher side of the doses, and using it for lower degree of erectile dysfunction could cause some issues. Use it only when a doctor says that you required this.