Low erection hardness belongs to erectile dysfunction, you can take sildenafil, phentolamine, testosterone undecanoate and other drugs. 1. Sildenafil: Sildenafil is a selective phosphodiesterase type 5 inhibitor, which can inhibit the activity of phosphodiesterase type 5 and increase the concentration of guanosine cyclic phosphate, which is favorable to the erection of the penis. 2. Phentolamine: Phentolamine belongs to the α-adrenergic receptor blocker, which has effects on the sex center and periphery, and is suitable for patients with mild to moderate erectile dysfunction. 3. Testosterone undecanoate: Elderly men often suffer from erectile dysfunction due to a decline in androgen levels in the body, which can be exogenously supplemented by oral testosterone undecanoate, thus improving the purpose of erectile dysfunction. Erectile hardness difficulty patients should go to the hospital in time, under the guidance of the doctor to choose the appropriate drug treatment, avoid home self-medication.