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an erection that won't go away (priapism). If you have an erection that lasts in excess of four several hours, get clinical support without delay. If it is not dealt with straight away, priapism can forever hurt your penis.أي شكل من النيترات، مثل نيتروجليسرين، أو إيزوسوربيد ثنائي النترات؛ ح