It starts working quickly — within just 30 minutes — and remains effective for up to 36 hours. There are some well known and relatively common side effects with Cialis that are mostly mild and short lived. There are two ways you can take tadalafil: on a daily basis or on an as-needed basis. Missed a Cialis tablet? For this reason Cialis is always taken before a workout.Generic Cialis (tadalafil): $10 per dose (10mg, 20mg) Daily generic Cialis (tadalafil): $3 per dose (mg, 5mg) Product details. Shipping: free shipping; Comparison of online Cialis prices. heart attack symptoms – chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating. Common Cialis side effects may include: headache; flushing (warmth, redness, or tingly feeling); nausea, upset stomach; stuffy nose; or. muscle pain, back pain, pain in your arms, legs, or back. This is not a complete list of side effects. From what I can tell, I have had a few people say it’s great with stronger erections and lasts way longer, but also others have had major side effects like dizziness and headaches .