Can You Take Viagra And Cialis Together?
By Erica Wilson, May-21-2026
Dr. Arjun Srivastav Medical Reviewer (Pharm D)In case you are an ED sufferer, you know about a few common medicines like Viagra and Cialis. Around the world, almost 50% or even more men use only these two brand names. However, you have taken a step ahead and want to experiment with these two medicines.
You now want to combine the effects of Viagra and Cialis, thinking it is more beneficial, and may help get rid of ED symptoms even longer. However, do you know how safe or unsafe it is? Do you have any idea what kind of risks or side effects you are prone to with your decision?
In case not, make sure to check this article, where we have given you a clear idea on combining the effects of Viagra and Cialis at the same time.
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Understanding How Viagra and Cialis Work
➤ Viagra (Sildenafil)
- Sildenafil was originally developed to treat pulmonary arterial hypertension, but it became widely known for treating ED. It works by inhibiting phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate (cGMP).
- By blocking PDE5, Viagra increases cGMP levels in penile smooth muscle, causing blood vessels to relax and dilate — facilitating an erection in response to sexual stimulation. Its effects typically last 4 to 6 hours.
Drug Facts
| Brand | Viagra |
| Drug Class | Phosphodiesterase Type 5 (PDE5) Inhibitor |
| Chemical Class | Benzenesulfonamide Derivative |
| Chemical Formula | C22H30N6O4S |
| Therapeutic Class | Sex Stimulants Rejuvenators |
| Habit Forming | No |
| Availability | Prescription only |
➤ Cialis (Tadalafil)
- Tadalafil works through the exact same PDE5-inhibiting pathway as sildenafil, making it pharmacologically similar. However, Cialis has a significantly longer half-life — it can remain active in the body for up to 36 hours, earning it the nickname “weekend pill”. Some men take a low daily dose (2.5–5 mg) for continuous readiness.
Drug Facts
| Brand | Cialis |
| Drug Class | Phosphodiesterase Type 5 (PDE5) Inhibitor |
| Chemical Class | Carboline Derivative |
| Chemical Formula | C22H19N3O4 |
| Therapeutic Class | Sex Stimulants Rejuvenators |
| Habit Forming | No |
| Availability | Prescription only |
Viagra And Cialis At The Time – Here Is What Happens Inside Your Body
The problem with taking Viagra and Cialis together is that both medicines are from the same category of pills, which is PDE-5 inhibitors.
Taking medicines from the same category means that you are just overdosing the effects of the pills inside your body. In the case of Viagra and Cialis, both of which are ED pills, there are risks of few mild to intense side effects.
Risks And Side Effects Of Using Viagra And Cialis
The main risks of using Viagra and Cialis are:
1. Low blood pressure
- Both Viagra and Cialis work by relaxing the muscles and widening the blood vessels. This can cause heavy flow of blood and long painful erection, often termed as priapism.
- The risk is that your blood pressure can drop low, as both drugs aids in fall of BP. This can cause severe dizziness, fainting, headaches or even a heart attack or stroke.
- This risk is even higher if you are taking medications like nitrates or alpha-blockers, which might induce a stroke or a heart attack.
2. Priapism
Using Viagra and Cialis together can increase the chance of getting priapism, which is a painful erection that lasts too long. This is an emergency because if the blood stays trapped in the penis for long it can cause permanent damage.
3. Hearing and vision changes
Viagra and Cialis can affect the blood flow to the eyes and ears. There is a chance of sudden vision loss or hearing loss if you do not adjust to any one of these medicines. Combining these two pills at the same time only increases the chances of these side effects and makes it further severe.
Viagra vs. Cialis: Detailed Comparison
| Feature | Viagra (Sildenafil) | Cialis (Tadalafil) |
|---|---|---|
| Active Ingredient | Sildenafil | Tadalafil |
| Onset of Action | 30-60 minutes | 30 minutes to 2 hours |
| Duration of Effects | 4-6 hours (up to 8 in some) | Up to 36 hours ("Weekend Pill") |
| Standard Doses | 25mg, 50mg, 100mg (as-needed only) | 2.5mg/5mg daily or 5mg/10mg/20mg as-needed |
| Food Interactions | High-fat meals delay/reduce effectiveness | Minimal impact; can take with or without food |
| Daily Use Option | Not recommended | Yes (low-dose for continuous effect) |
| Additional Uses | Primarily ED | ED + Benign Prostatic Hyperplasia (BPH) |
| Peak Concentration | ~1 hour | ~2 hours |
When Do Doctors Change Your Dysfunction Treatment With Viagra Or Cialis?
The doctors may consider changing your ED treatment with Viagra or Cialis. The doctors have to take into equation several things at this point. For example, what kind of remedy the patient is on, their health and age conditions, what dose to give, the frequency of use and so on?
Here are some reasons why a doctor might change your treatment:
- If the initial treatment is not working
- If you are having problems with food interactions
- If the side effects are causing problems in your life
- If you are facing health issues for the initial dosage
Note:
Always take ED medications only as prescribed, and never combine them without explicit medical supervision.
Viagra Or Cialis – How To Know Which One Will Work Best Inside Your Body
What you might be surprised to know is that your lifestyle plays a major factor in determining if Viagra or Cialis will adjust better for your health.
Here are some things to consider:
- Choose Viagra if you want to use it when you need it and can plan ahead
- Choose Cialis if you want to be able to have sex at any time without having to plan
Matching Your Food Habits
Your food habits can cause interaction or even help increase elongate the effects of the medicine in your body.
- Viagra works best when you take it with a low-carb meal.
- Cialis is not affected by food, unless it is too heavy.
Knowing How Long These Medicines Will Last
Expect that you can get hard for up to a maximum of 4 to 6 hours of taking the Viagra pill.
Cialis, on the other hand, is one of the long-lasting medicines. The longest it can stay active in your body is for 36 hours.
What Are Some Safer Alternatives To Using Viagra And Cialis?
Instead of using both the drugs at the same time and increasing the risks of side effects, here are a few options that you can try out-
1. Increasing The Dose Of One Medication
Increase the strength of your medicine especially if it is not helping you get hard before having sex.
2. Switching To Cialis
This is definitely an option to consider on case you want to get longer effects of the medicine and getting an erection within a shorter notice. We have told you, Viagra can only give up to 6 hours of effective time for you to get hard. Cialis stays active in your body way longer than that. Moreover, Cialis can make you hard within 15-20 minutes of taking it, which is much shorter than Viagra.
3. Making Lifestyle Changes
Of course, your ED medicine is going to help change your sexual life for the better. However, it is also your duty to make amends in your current lifestyle. Doing so will help increase the effects of the medicine in your body plus act in their own natural way to heal your body condition.
Here is some of the lifestyle changes, you need to make-
- Exercising daily
- Bursts of yoga and meditation after work
- Taking healthy diet
- Getting rid of substance use habits.
- Hydration
- Regular and enough sleep
What Do You Do If You Accidentally Use Both Viagra And Cialis?
In case you have any of the signs given below, get an emergency help to the doctors.
- Fainting
- Shortness of breath
- Sudden Hearing loss
- An erection that lasts long
Follow these steps-
- If you are feeling okay, sit down and stay hydrated.
- Do not take any medications and try to stay calm.
- Tell exactly what happened to the doctors without hiding your own faults.
What To Tell The Doctors When You Have Used Viagra And Cialis At The Same Time?
At first, you need to tell the doctors what medicine you have been originally using. For example, if you have been using the 100 mg dose of Viagra recommended by the doctors, tell it. Now tell them what you tried experimenting with like a high dose of Cialis.
Remember that Viagra and Cialis are safe only if they are taken one at a time. Taking together only increases your health risks and chances of severer side effects.
General Instructions To Follow
- Always follow the instructions. Take the medication as directed.
- If you have any questions or concerns talk to a doctor or pharmacist.
- They can help you make a decision about your treatment.
- Viagra and Cialis are effective medications, but they should be used safely and responsibly.
- Never use Viagra and Cialis together without talking to a doctor.
Medical Disclaimer
This article is intended for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting, stopping, or combining any medications.
FAQ
What is the lowest dose of Viagra for mild ED?
The lowest dose of Viagra that a doctor recommends you to, even in case of mild ED issues, is 25 mg.
What is the strongest dose of Cialis and its lasting time?
Often called as the weekend pill, the highest dose for Cialis is the 60 mg dose, which can act on your ED issues for up to 36 hours.
Where to buy ED pills?
Check out our online pharmacy AustraliaRXMeds, where not only you get the globally approved brands for ED like Viagra and Cialis but also new generic versions at the best prices.
Which lasts longer?
Cialis typically lasts much longer than Viagra.
Can I take a small dose of both?
Even lower doses may still increase risks when combined. Always consult a healthcare provider first.
Years of Experience: 10+ years Education: B.Sc. in Biomedical Science (Monash University, Melbourne, Australia) PG Diploma in Health & Medical Communication (University of Sydney, Australia) Experience: Erica Wilson is an…
