Viagra and Cialis: what to know
Viagra and Cialis are brand names for sildenafil and tadalafil. Compare how long they last, the key safety risks, and how to access them.
Key facts
- Sildenafil is $69.67/month (billed $209 every 90 days), charged only after a clinician approves it.
- Answer a few health questions online. A licensed clinician reviews them. If approved, it ships to your door.
- Adults 18 or older. A licensed clinician reviews your health history and decides whether treatment is appropriate for you. Availability depends on the state you live in.
People searching “viagra and cialis” are usually comparing two erectile dysfunction (ED) medicines: sildenafil (brand Viagra) and tadalafil (brand Cialis). They work in a similar way, but differ in timing, duration, and how you might use them. Vitals Vault offers generic sildenafil and generic tadalafil by prescription when appropriate. A licensed clinician reviews your health history to decide if treatment fits you, and availability depends on your state.
- “Viagra and Cialis” usually means sildenafil and tadalafil for erectile dysfunction.
- Both improve erections with sexual stimulation, but they differ in how long effects may last.
- Do not use either with nitrates, and use caution with certain blood pressure medicines.
- Seek urgent care for chest pain, sudden vision or hearing loss, or an erection lasting over 4 hours.
What “Viagra and Cialis” are
Brand vs generic names
Viagra is the brand name for sildenafil, and Cialis is the brand name for tadalafil. Vitals Vault offers generic sildenafil and generic tadalafil, which contain the same active ingredients as the brands. A prescription is required for both.
What they treat
Sildenafil and tadalafil are FDA-approved to treat erectile dysfunction, which is difficulty getting or keeping an erection firm enough for sex. They do not increase sexual desire, and they do not cause an automatic erection without sexual stimulation.
What they are not
These medications are not the same as testosterone therapy, and they do not treat every cause of ED. ED can be related to blood flow, nerves, hormones, medications, stress, or relationship factors, so the right plan depends on the cause.
Why ED evaluation matters
ED can sometimes be an early sign of cardiovascular disease or other health issues. A clinician may ask about symptoms, medications, and risk factors, and may recommend labs or other testing to look for contributing conditions.
How sildenafil and tadalafil work
The basic mechanism
Sildenafil and tadalafil are PDE5 inhibitors. They help the blood vessels in the penis relax by supporting the nitric oxide and cGMP pathway, which can improve blood flow during sexual stimulation. This can make it easier to get and keep an erection.
Why stimulation is still needed
PDE5 inhibitors support the body’s normal erection response, but they do not create sexual arousal. If there is no sexual stimulation, you may not notice an effect.
Why duration differs
Sildenafil and tadalafil are in the same drug class, but they have different pharmacokinetics, meaning the body processes them differently. This is one reason tadalafil can last longer for some people, while sildenafil is often used with more time-specific planning.
Other approved uses
Tadalafil is also FDA-approved for signs and symptoms of benign prostatic hyperplasia (BPH) and for ED with BPH. Sildenafil is also approved under a different brand name for pulmonary arterial hypertension, which is a different condition and dosing regimen.
Who these medications may be for
Adults with ED
These medications are commonly used by adults with erectile dysfunction who want an as-needed option. A clinician can help confirm ED, review likely causes, and check whether a PDE5 inhibitor is safe with your medical history and other medications.
People who want flexibility
Some people prefer a medication with a shorter window, while others prefer a longer window. The best fit depends on how you want to time sex, how you respond to the medication, and what side effects you experience.
People with certain health risks
If you have cardiovascular disease risk factors, ED can be a reason to check in on heart health. A clinician may recommend addressing blood pressure, diabetes, cholesterol, sleep, tobacco use, and other factors alongside medication.
People with possible hormone issues
If low libido, fatigue, or reduced morning erections are part of the picture, a clinician may consider checking testosterone and related labs. Treating low testosterone, when present, is a different approach than using a PDE5 inhibitor.
Who should not take sildenafil or tadalafil
Anyone using nitrates
Do not take sildenafil or tadalafil if you use nitrates (for example, nitroglycerin) for chest pain. The combination can cause a dangerous drop in blood pressure. Tell a clinician about any nitrate use, including intermittent use.
Certain heart conditions
If you have unstable cardiovascular disease, recent serious heart problems, or have been told to avoid sexual activity for medical reasons, a clinician should evaluate you before considering ED medication. ED treatment decisions depend on your overall cardiac risk.
Severe low blood pressure or dehydration
These medications can lower blood pressure. If you have low blood pressure, are dehydrated, or take multiple blood pressure lowering medications, a clinician may advise caution or a different plan.
Specific medicine interactions
Some medications can raise PDE5 inhibitor levels or increase blood pressure effects, including certain alpha-blockers and some antifungals, antibiotics, and HIV medicines. Always share your full medication list, including supplements.
Allergy to ingredients
Do not take a medication if you have had an allergic reaction to it or its ingredients. Seek medical help right away for signs of a severe allergic reaction such as swelling of the face or throat or trouble breathing.
What to expect when comparing Viagra and Cialis
| Feature | Sildenafil (Viagra) | Tadalafil (Cialis) |
|---|---|---|
| Drug class | PDE5 inhibitor | PDE5 inhibitor |
| Typical use pattern | Often taken as needed | Can be taken as needed; also has daily-use labeling for some indications |
| How long effects may last | Shorter duration compared with tadalafil | Longer duration compared with sildenafil |
| Food considerations | A high-fat meal can delay absorption for sildenafil | Food does not meaningfully affect tadalafil absorption |
Timing and planning
Many people choose based on how predictable they want the timing to be and how long they want a window of effect. Your response can vary based on dose, other medications, alcohol, and underlying health conditions.
If one does not work
Not responding to one medication does not always mean the other will not help. A clinician may review whether ED is due to blood flow, nerves, hormones, mental health, relationship factors, or another medical condition, and may adjust the plan accordingly.
When to reassess
If ED is new, worsening, or accompanied by other symptoms such as reduced exercise tolerance or chest discomfort, it is worth a medical evaluation. ED treatment can be part of a broader plan to reduce cardiovascular risk.
Side effects and safety warnings
Headache and flushing
Headache and facial flushing are common side effects with PDE5 inhibitors. They happen because the medications affect blood vessels in other parts of the body, not just the penis. Hydration and avoiding excess alcohol may help, but discuss persistent symptoms with a clinician.
Indigestion and nasal congestion
Some people notice heartburn, upset stomach, or a stuffy nose. These effects are usually mild to moderate, but they can be bothersome enough to influence which medication you prefer. Tell a clinician if you have severe reflux or take medicines that interact.
Back pain or muscle aches
Back pain and muscle aches are reported more often with tadalafil than with sildenafil. Symptoms are usually temporary, but you should discuss significant pain, weakness, or symptoms that do not resolve, especially if you have kidney disease or take other medicines affecting muscles.
Low blood pressure and fainting
Because these medications can lower blood pressure, dizziness or lightheadedness can occur, especially when combined with alcohol, dehydration, alpha-blockers, or other blood pressure medicines. Seek medical help for fainting or severe dizziness.
Priapism (erection over 4 hours)
An erection lasting more than 4 hours is a medical emergency because it can cause permanent tissue damage. Go to urgent or emergency care right away if this happens, even if it is not painful.
Sudden vision or hearing loss
Rarely, sudden decrease or loss of vision or hearing has been reported with PDE5 inhibitors. Stop sexual activity and seek urgent medical evaluation if you notice sudden vision changes, ringing in the ears, or sudden hearing loss.
Cost and access
What drives cost
Cost depends on whether you use a brand or a generic, the dose and quantity prescribed, and where you fill the prescription. Brand-name Viagra and Cialis are typically more expensive than generic sildenafil and generic tadalafil.
Insurance coverage varies
Coverage for ED medications varies widely by plan, and some plans exclude ED drugs or limit quantities. A clinician can help document medical need when appropriate, but coverage decisions are made by the insurer.
Telehealth access
Online care can streamline evaluation and prescribing for many people, but you still need a clinician review to confirm safety. Availability of treatment services depends on your state, and some people may be asked for recent lab results.
Where to see current prices
If you are comparing options, current prices for the product on this page are shown on this page in the price block. Your final cost can also depend on pharmacy pricing and whether you use insurance.
How to get sildenafil or tadalafil safely
- 1
Start with a health review
Share your symptoms, medical history, and a complete medication list so a clinician can check safety and interactions.
- 2
Discuss goals and timing
Talk through how you want to use medication, what you have tried, and whether stress, sleep, or relationship factors may contribute.
- 3
Complete any recommended labs
If needed, a clinician may request labs to look for contributing issues such as hormone or metabolic factors.
- 4
Follow up and adjust if needed
If side effects, lack of effect, or new symptoms occur, follow up so the clinician can reassess the plan and safety.
Frequently Asked Questions
Are Viagra and Cialis the same thing?
They are different brand-name medications. Viagra is sildenafil and Cialis is tadalafil, and both are PDE5 inhibitors used for erectile dysfunction. They work similarly but can differ in duration and side effects.
Is viagra and cialis safe if I take heart medicines?
It depends on which heart medicines you take and your heart health. Do not use sildenafil or tadalafil with nitrates because the combination can dangerously lower blood pressure. A clinician should review your full medication list, including alpha-blockers.
What are the most serious side effects of sildenafil or tadalafil?
Serious risks include a dangerous drop in blood pressure, priapism (an erection lasting more than 4 hours), and rare sudden vision or hearing loss. Seek urgent care for these symptoms. Discuss any side effects with a clinician before taking another dose.
Do Viagra or Cialis work without sexual stimulation?
No. Sildenafil and tadalafil support the body’s normal erection response, but sexual stimulation is still required. If you are not getting an effect, a clinician can help check for other causes of ED.
How much do Viagra and Cialis cost?
Cost depends on whether you use brand or generic, the dose and quantity, pharmacy pricing, and insurance coverage. This page shows current prices for the product linked in the price block, but your final cost can vary. A clinician can help you consider alternatives if needed.