Zhewitra 40 drug can be used to treat sexual disorders such as impotence or erectile dysfunction. This medication contains the chemical Vardenafil, which increases blood flow to the penile tissues and relaxes the penile muscles. Only men between the ages of 18 and 65 take this drug. This medication can be used before or after meals. You should take this medication with water but do not break or chew the pill. While using this medication, avoid eating fatty meals. This medication's effects last 4 to 6 hours.