Key takeaways
Cialis (tadalafil) and Viagra (sildenafil) are popular erectile dysfunction (ED) medications that work in part by increasing blood flow to the penis, making it easier to get and keep an erection.
Cialis and Viagra can be taken together in specific doses if prescribed by a healthcare provider, but combining them without medical supervision can cause dangerous side effects.
You could try compounded treatments, which are custom medications created by a pharmacist to combine specific doses of active ingredients. For example, Ro Sparks combines the active ingredients of Cialis and Viagra into one fast-acting sublingual tablet.
Talk to a healthcare provider about your treatment options, especially if you have health conditions like heart disease, diabetes, or performance anxiety that could be affecting your sexual performance.
Here's what we'll cover
Key takeaways
Cialis (tadalafil) and Viagra (sildenafil) are popular erectile dysfunction (ED) medications that work in part by increasing blood flow to the penis, making it easier to get and keep an erection.
Cialis and Viagra can be taken together in specific doses if prescribed by a healthcare provider, but combining them without medical supervision can cause dangerous side effects.
You could try compounded treatments, which are custom medications created by a pharmacist to combine specific doses of active ingredients. For example, Ro Sparks combines the active ingredients of Cialis and Viagra into one fast-acting sublingual tablet.
Talk to a healthcare provider about your treatment options, especially if you have health conditions like heart disease, diabetes, or performance anxiety that could be affecting your sexual performance.
Taking Viagra (sildenafil) and Cialis (tadalafil) together is generally not recommended without medical supervision. That said, there are instances where a healthcare provider might consider a carefully dosed combination. In most cases, this involves compounding by a pharmacist who tailors the medication to your specific needs based on a healthcare provider’s prescription.
Products such as Ro Sparks combine the active ingredients of Viagra and Cialis into a single sublingual tablet. While Ro Sparks is not approved by the US Food and Drug Administration (FDA), its active ingredients have been individually FDA-approved for the treatment of ED.
Taking these two medications together on your own without a healthcare provider’s guidance could lead to serious side effects such as dangerous drops in blood pressure, fainting, severe headache, or, in rare cases, priapism (a prolonged erection that requires emergency medical treatment).
Read on to learn more about taking Viagra and Cialis together if you’re considering taking both meds.
Can you take Viagra and Cialis together?
Yes, you can take Viagra and Cialis together, but only in some instances where a healthcare provider might recommend a safe, carefully dosed approach. Taking Cialis and Viagra together isn’t something you should try on your own.
Ro Sparks is a prescription treatment for ED that combines lower doses of both medications into one sublingual tablet, designed for faster action and longer-lasting effects. Ro Sparks is not FDA-approved, but its individual ingredients have been individually FDA-approved for the treatment of ED.
Viagra can start working in just 12 minutes for some people (though this is quicker than the average experience of 30 minutes to one hour), but it wears off within a few hours. Cialis, on the other hand, stays active in the body much longer.
While combining the two at carefully selected doses under medical supervision may offer benefits for some men with severe ED, taking full doses of both medications without medical supervision could cause serious side effects like dangerous drops in blood pressure, dizziness, fainting, or, in rare cases, priapism.
That’s why combining Viagra and Cialis should only be done carefully and under guidance from a healthcare provider.
Have better sex with Ro
How do you take Viagra and Cialis together?
Combining Viagra and Cialis isn’t as simple as just taking both pills — it requires careful dosing that only a healthcare provider can prescribe. This approach can be accomplished through compounding, where a pharmacist creates a custom medication by combining specific amounts of active ingredients based on your healthcare provider’s prescription.
Compounding allows providers to deliver a more personalized ED treatment than what’s commercially available. Instead of taking separate doses of Viagra and Cialis, compounded formulations combine both medications into a single, tailored dose.
Compounding pharmacies are overseen by the FDA and state Boards of Pharmacy, ensuring they meet both federal and state regulations for compounding. Unlike commercially manufactured drugs, compounded medications are exempt from the FDA’s drug approval process when prepared in accordance with these regulations.
Can you take Cialis in the morning and Viagra at night?
Taking Cialis in the morning and Viagra is not generally recommended unless specifically directed by a healthcare provider.
Since both Cialis (tadalafil) and Viagra (sildenafil) belong to the same class of drugs called phosphodiesterase type 5 (PDE5) inhibitors and affect the same biological pathway, combining these medications without proper guidance can lead to serious health risks, particularly low blood pressure. This is especially important for people taking nitrates, which should not be taken with PDE5 inhibitors due to the risk of severely low blood pressure.
You should also be careful when taking PDE5 inhibitors alongside alpha-blockers, which can have additional blood-pressure-lowering effects.
In some cases, a healthcare provider may prescribe daily low-dose Cialis alongside occasional Viagra to be taken as needed. This approach can help if daily Cialis does not provide you with enough of an erection for sexual intercourse. There are other ways to take these medications together, but any combination dosing should always be discussed with a healthcare provider.
Precautions when taking Viagra and Cialis together
What to consider before you combine Viagra and Cialis:
Be mindful of medication interactions: You should not take Cialis or Viagra with nitrates (used for chest pain) as this combination can cause a dangerous drop in blood pressure. If you are taking other medications for high blood pressure, such as alpha blockers, your healthcare provider may prescribe you a low dose to start to avoid low blood pressure.
Certain populations should use caution when taking Cialis and Viagra:
Adults aged 65 or older: Due to slower drug metabolism, older adults are usually started on a lower dose of 25 mg of Viagra. Combining Cialis and Viagra should be done with caution in older adults.
Those with liver or kidney issues: Those with severe kidney disease or any degree of liver impairment are usually started on a lower dose of sildenafil at first because the medication doesn’t clear as effectively from the body. Combining drugs in this population should be done with caution.
Those with heart issues: Ask your doctor if sexual activity is safe for you if you have heart disease or have experienced recent heart attacks or strokes.
It’s important to recognize serious side effects when taking these medications together. Seek immediate medical help if you experience sudden vision loss, sudden hearing loss, or an erection lasting more than four hours (priapism). If priapism isn’t treated quickly, it can cause permanent damage to the penis.
Attempting to mix Cialis and Viagra on your own can be risky and is not recommended. If you’re curious about whether using both medications might work for you, talk to a healthcare provider who knows your medical history.
Where can you get combined Viagra and Cialis?
If you’re interested in a combination of Viagra and Cialis, Ro Sparks can be a great option. Ro Sparks blends the active ingredients of both medications into a fast-acting sublingual tablet.
Unlike standard pills that you swallow whole, Ro Sparks dissolve under your tongue, allowing the medication to enter your bloodstream directly.
This means they can work faster — sometimes in as little as 15 minutes after dissolving— and can keep you ready for sex for up to 36 hours. Taking the medication this way may also help avoid any delays caused by food or digestion, giving you more predictable results.
Since ED medications only work when you’re sexually aroused, you can take your time getting in the mood while the treatment takes effect.
If you’re interested in trying a combination ED treatment like Ro Sparks, the process is safe and straightforward. Here’s what to expect:
Complete an online health assessment: Start by filling out a secure online questionnaire about your medical history, current medications, and ED symptoms. This evaluation helps the healthcare provider understand your specific needs to recommend the best treatment. The assessment takes about 20 minutes and covers key health details needed for a personalized prescription.
Consult with a licensed healthcare provider: After submitting your assessment, a licensed provider will review your information within 24 hours. They’ll consider your medical history, symptoms, and treatment preferences. If needed, they may reach out with follow-up questions to ensure they have a full understanding of your health profile.
Receive your prescription: If Ro Sparks is prescribed, your medication will be prepared and shipped directly to your home in discreet packaging. Ro only works with FDA-regulated manufacturers, so you can be confident your prescription meets strict safety and quality standards.
Get ongoing support: After starting your treatment, you’ll have access to unlimited follow-ups with Ro’s healthcare team. Whether you need a dosage adjustment, have questions about side effects, or want to discuss your progress, the team is available to provide continued care and guidance.
What are the differences between Cialis and Viagra?
The biggest difference between Cialis and Viagra is how long their effects last:
Viagra can typically work for about four hours after taking a dose. This makes it more suitable for planned sexual activity, as its effects are limited to a shorter window.
Cialis can last much longer — up to 36 hours — which is why it is sometimes referred to as “the weekend pill.” Its extended duration provides more flexibility, making it easier to have sex without carefully planning when to take the medication.
The timing and frequency of taking Cialis and Viagra also differ:
Viagra is usually taken only when needed, about 30–60 minutes before sex. Its absorption can be slowed down if you take it along with a heavy or high-fat meal, which means it may take longer to work.
Cialis offers two different dosing styles. It can be taken as needed, about 30 minutes before sexual activity, or as a daily low-dose tablet. The daily option keeps the medication in your system consistently, allowing for more spontaneous sexual activity.
Unlike Viagra, high-fat meals do not impact how quickly Cialis kicks in.
The dosage for both medications depends on how often you expect to have sex and how your body responds to the treatment. The differences in dosages are:
Viagra is usually prescribed in a single dose, often starting at 50 mg (though this will depend on your individual prescription), and taken as needed before sexual activity. Depending on how effective the treatment is and whether any side effects occur, your healthcare provider may adjust your dosage.
Cialis has more dosing flexibility. If taken daily, the typical starting dose is 2.5 mg, which may be increased to 5 mg if necessary. For occasional use, the recommended starting dose is 10 mg, with adjustments up to 20 mg if needed. Of course, your individual dosing may vary depending on your needs.
Your healthcare provider will help determine the best dosage for you based on your lifestyle, medical history, and response to the medication.
How to choose between Viagra and Cialis?
Choosing between Cialis and Viagra depends on your personal preferences, how often you expect to have sex, and how your body responds to each medication.
Why you may prefer Viagra: Viagra may be the better option if you prefer taking a pill only when needed and want something with a shorter active window. Its effects wear off after about four hours, making it a good choice for occasional use if you don’t want to have the medication in your system for longer.
Why you may prefer Cialis: Cialis may be a better fit if you want more flexibility and prefer a longer-lasting effect – its extended duration allows for more spontaneity. With Cialis, there’s also the option of a daily low-dose tablet that works for those who want a consistent routine and would like to be able to have sex at any time without needing to time medication around it.
How long each medication lasts in your body may depend on your age, kidney or liver function, and if you’re taking certain other medications. In these situations, your healthcare provider may recommend a different dosage of Cialis or Viagra to adjust for differences in how your body processes the medication.
Ultimately, your healthcare provider can help you determine which medication is the safest and most effective choice based on your health history, treatment goals, and how your body responds to each option.
What if Cialis or Viagra isn’t working for me?
If Cialis or Viagra isn’t working for you, there are other options you can consider. Here’s a quick overview — but remember these aren’t exhaustive. Your healthcare provider can help determine if other treatment modalities might be better suited for you.
Other ED medications
Studies show that up to half of people who don’t initially respond to one PDE5 inhibitor will find benefit with a different one. If you’ve been using low-dose PDE5 inhibitors as needed and they are not giving you the results you want, you could consider other options.
One of those options is taking Cialis every day. Daily Cialis can be taken as a low-dose medication at the same time every day to provide a consistent dose of tadalafil. This allows it to build up in your system over time to keep you ready for sex.
Ro also offers Daily Rise Gummies, a daily dose of tadalafil in gummy form. While not FDA-approved for the treatment of ED, these gummies contain tadalafil as their active ingredient, which has been FDA-approved for ED.
Your healthcare provider can guide you through your options and adjust your prescription based on how your body reacts.
Try alternative ED treatments
If medications like Viagra or Cialis aren’t working anymore, there are other options to try.
Vacuum constriction devices (penis pumps)
While the idea of a mechanical device instead of medication can seem unsettling, these devices can be particularly useful for anyone who has ED because of physical injury or surgery. This includes ED due to procedures for prostate or bladder cancer.
Hormone therapy
If your ED is linked to low testosterone levels, your healthcare provider might suggest testosterone replacement therapy. This treatment can help balance hormone levels, boosting both libido and sexual performance. A simple blood test can determine if a hormonal imbalance is contributing to your symptoms.
Lifestyle changes
Lifestyle choices can play a role in ED. This includes smoking, an unhealthy diet, limited physical activity, eating too many calories, and excess alcohol use. All of these factors may impact blood flow by causing inflammation and reducing nitric oxide production—a molecule essential for healthy circulation.
Making positive changes, such as eating a balanced diet, staying active, and maintaining a healthy weight, can support better erectile function. Research suggests that healthier habits may even improve or reverse ED symptoms, especially in people with conditions like obesity or metabolic syndrome.
Bottom line: can you take Cialis and Viagra together?
In some cases, Cialis and Viagra can be used together, but it depends on the dosage and must always be done under the guidance of a healthcare provider.
Here’s what you should know:
Combining these medications without proper supervision can lead to serious side effects. Potential side effects include dangerously low blood pressure, dizziness, and fainting.
In some cases, a provider may prescribe compounded treatments that combine sildenafil and tadalafil. Products like Ro Sparks contain carefully controlled amounts of both medications under medical supervision.
Viagra and Cialis work differently for different lifestyles. Viagra is shorter-acting and typically taken as needed, while Cialis lasts longer and may allow for more spontaneity.
If one ED medication isn’t working, other options may help. Switching PDE5 inhibitors, trying daily Cialis, or exploring alternative treatments may improve results.
ED can have both physical and psychological causes. A healthcare provider can determine whether factors like anxiety, depression, stress, or hormone issues may be contributing to symptoms.
If you’re exploring ED treatment options, speak with a licensed healthcare provider who can help you find a safe and effective solution tailored to your needs.
Frequently asked questions (FAQs)
How do Viagra and Cialis work?
Viagra and Cialis are PDE5 inhibitors, a class of medications used to treat ED by improving blood flow to the penis. Here’s how they work: when you are sexually aroused, the body releases a chemical called nitric oxide in the penis, which triggers a chain reaction that relaxes the smooth muscle and allows blood to flow in, producing an erection.
Normally, an enzyme called PDE5 breaks down this process and ends the erection. Viagra and Cialis block PDE5, which helps blood flow last longer, making it easier to get and keep an erection when you are sexually aroused.
ED can result from a range of underlying issues, including reduced nitric oxide production, endothelial dysfunction, nerve damage, or hormonal imbalances, which is why treatment may need to address more than one factor.
Is it safe to take Cialis and sildenafil together?
Taking Cialis and sildenafil together isn’t recommended unless prescribed by a healthcare provider. Because both medications can lower blood pressure, combining them without approval and supervision from a healthcare provider may increase the risk of side effects related to hypotension, such as dizziness, lightheadedness, and fainting.
What happens if I take Viagra and Cialis together?
Taking Viagra and Cialis together may increase the risk of dangerously low blood pressure and related symptoms such as dizziness, lightheadedness, and fainting.
Why do men prefer Cialis over Viagra?
Some men may prefer Cialis over Viagra because it lasts longer — up to 36 hours compared to about four hours for Viagra.
Is there a pill that combines Viagra and Cialis?
Yes. Some compounded ED treatments, such as Ro Sparks, combine sildenafil (Viagra) and tadalafil (Cialis) into a single prescription medication designed to be used under medical supervision.
DISCLAIMER
If you have any medical questions or concerns, please talk to your healthcare provider. The articles on Health Guide are underpinned by peer-reviewed research and information drawn from medical societies and governmental agencies. However, they are not a substitute for professional medical advice, diagnosis, or treatment.
Cialis Important Safety Information: Read more about serious warnings and safety info.
Viagra Important Safety Information: Read more about serious warnings and safety info.
References
Deveci, S., Peşkircioğlu, L., Aygün, C., et al. (2004). Sublingual sildenafil in the treatment of erectile dysfunction: Faster onset of action with less dose. International Journal of Urology, 11(11), 989–992. doi: 10.1111/j.1442-2042.2004.00933.x. Retrieved from https://pubmed.ncbi.nlm.nih.gov/15509203/
Eardley, I., Ellis, P., Boolell, M., et al. (2002). Onset and duration of action of sildenafil for the treatment of erectile dysfunction. British Journal of Clinical Pharmacology, 53 Suppl 1(Suppl 1), 61S–65S. doi: 10.1046/j.0306-5251.2001.00034.x. Retrieved from https://pmc.ncbi.nlm.nih.gov/articles/PMC1874251/
Eli Lilly & Company. (2023). Cialis (tadalafil) tablets, for oral use: Highlights of prescribing information. Retrieved from https://pi.lilly.com/us/cialis-pi.pdf
Leslie, S. W. & Sooriyamoorthy, T. (2024). Erectile Dysfunction. StatPearls. Retrieved from https://pubmed.ncbi.nlm.nih.gov/32965924/
Maiorino, M. I., Bellastella, G., & Esposito, K. (2015). Lifestyle modifications and erectile dysfunction: what can be expected?. Asian Journal of Andrology, 17(1), 5–10. doi: 10.4103/1008-682X.137687. Retrieved from https://pubmed.ncbi.nlm.nih.gov/25248655/
U.S. Food and Drug Administration (FDA). (2025). Compounding and the FDA: Questions and Answers. Retrieved from https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers
U.S. Food and Drug Administration (FDA). (2017). Highlights of prescribing information: Viagra (sildenafil citrate) tablets, for oral use. Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/020895s048lbl.pdf


















