Common ones include: Flushing of the skin. Please expect up to 4 to 6 weeks for reimbursement. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Rarely reported side effects include: an erection that will not go away priapism.Yes, penile pumps (also known as ED pumps) are over-the-counter devices that work to treat erectile dysfunction (), similar to Viagra. Viagra is usually the first-line . Cialis is only available by prescription in the United States. Viagra: Additionally, a study from Trusted Source. found that combining L-arginine and sildenafil (Viagra) worked better for. $ One-time offer Get free savings Most popular Low price Walmart $ retail Save 99% $ One-time offer Get free savings Walgreens $1, retail Save 99%.