Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. In some cases, online ED providers accept health insurance. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. · With SingleCare, Cialis costs as little as $ for 30, 20mg Tablet of generic Cialis, which could be more affordable than your insurance. Get our coupons for Cialis . Note: Some pharmacies do not allow the savings card to be used for opioid drugs. How much does tadalafil or cialis cost near you? Find the best tadalafil or cialis prices near . What is Tadalafil (Cialis) used for? Erectile dysfunction Benign prostatic hyperplasia (BPH).