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Scott Weaver

Updated at: September 25, 2026 · 10 min read

Updated at: September 25, 202610 min read

Does Viagra Interact With Other Medications?

Viagra, also known as sildenafil, is safe for almost any adult cisgender male to use, however, some health conditions may mean Viagra isn’t right for you to use as it may increase the risk of harmful side-effects. This is also true when it comes to certain medications which can interact with Viagra and alter how it works. It is important to always speak to your doctor before you start using a new medication, including Viagra. Below we will provide information regarding these interactions and more things you should know about remaining safe when using Viagra.

Can Viagra be dangerous?

For the majority of users, Viagra is completely safe, however, for certain individuals, it can pose a risk. Typically Viagra is well tolerated and does not cause side effects, or mild side effects that pass quickly. People using certain medications such as nitric oxide or nitrates can be at risk when using Viagra alongside their medication. If you fall under this category it is important to consult with a healthcare professional for further advice before using both medications alongside each other.

It should also be noted that Viagra is not for recreational use, and should not be used by someone who does not suffer from erectile dysfunction.

What warnings does sildenafil come with?

As with all other medications, sildenafil (the active ingredient in Viagra, comes with a number of warnings. You can typically find these warnings in the patient information leaflet provided with Viagra, which you should read in full before you start using the medication.

It is important to be aware of the dosage of Viagra you should be using and to always stick to this, no more or no less. If you differ from the dosage of Viagra you have been told to use then you may be at higher risk of experiencing side effects.

You should also let your healthcare provider know about any other medications you are using, or conditions you are suffering from, as these factors can also influence the risk of experiencing side effects.

Can patients with high blood pressure use Viagra?

Cisgender men with erectile dysfunction may also have other health conditions that contribute to their ED, with high blood pressure also being closely associated with the condition. Hard blood vessels caused by high blood pressure can prevent blood supply to the penis which can cause erectile issues.

Viagra (sildenafil) can be used by people with high blood pressure if their healthcare providers feel it will not interact with the medications they are using. Doctors may wish to keep an eye on the blood pressure levels of those using Viagra alongside high blood pressure medications.

Can Viagra raise your blood pressure?

Changes in blood pressure are typically marked as an uncommon side effect of Viagra (sildenafil). Sildenafil, the active ingredient in Viagra, has been shown to moderately lower blood pressure. If you notice any symptoms of blood pressure changes after you have used Viagra then it is important to speak to your healthcare provider for further advice.

Is Viagra safe for people over the age of 70 years old?

Yes, it is safe for people over the age of 70 to use Viagra if their healthcare provider feels it is a viable treatment option that will not interact with other medications they are using and other conditions they are suffering from. Usually, someone over the age of 70 years old will be started with a dosage of 25mg to see how they react to the medication. If they react well their dosage may be raised provided their healthcare provider feels it is necessary and viable.

People over the age of 70 sometimes suffer from cardiovascular conditions which can mean that Viagra (sildenafil) is not the best medication for them. If this is the case they may wish to consider talking to their healthcare provider for advice on what medication may be best for treating their erectile dysfunction.

Can Diabetes patients use Viagra?

Yes, people with diabetes can be treated with Viagra if they are suffering from erectile dysfunction. Diabetes can actually increase the chances of experiencing erectile dysfunction. For some people, Viagra may not provide adequate results and other options such as Cialis (tadalafil) , Levitra (vardenafil) , Spedra (avanafil) , Vitaros cream (alprostadil) and devices such as penis pumps may be recommended by healthcare providers.

Can patients who have undergone prostate removal take Viagra (sildenafil)?

Surgery involving the prostate can cause erectile dysfunction. Your surgeon or doctor will usually have a conversation with you about regaining sexual function after your surgery, and medications like Viagra are usually referenced as potential treatment options to help with penile rehab.

Viagra (Sildenafil) Contraindications

It is important to make clear that not everyone can use Viagra. A contraindication refers to a condition or situation in which a particular medication, treatment or procedure should not be used. For Viagra, there are a number of contraindications that healthcare providers adhere to. People with severe liver or heart conditions and certain eye conditions should not use medications containing sildenafil. Other conditions that may mean Viagra is avoided as a treatment option include penis deformity, leukaemia, stomach ulcers and conditions that cause blood clotting. You may wish to speak to your healthcare provider who may be able to find you a suitable alternative to Viagra if you cannot use it.

Is it safe to use Viagra if you have a heart condition?

Using Viagra when you have a heart condition can depend on a number of factors. These factors include age, severity of your condition and whether you are taking certain medications. You should only ever use this medication if you have been prescribed it by a healthcare provider.

Can you use Viagra after a heart attack?

If you have had a heart attack your recovery will usually influence your viability for certain medications. Your doctor will provide you with a green light to engage in mild to moderate physical activity depending on how well you have recovered from your heart attack. This will also give you a green light to engage in sexual activity which may be more difficult if your heart attack has caused erectile dysfunction. Viagra can be used to help treat erectile dysfunction after a heart attack if your healthcare provider feels that it is a suitable treatment option.

Should you avoid taking other drugs when using Viagra?

There are a number of different medications that you should avoid using if you are taking Viagra for erectile dysfunction. The most notable medications to avoid are nitrates (used for chest pain), Riociguat (a medication used to treat (chronic thromboembolic pulmonary hypertension) and nitric oxide donors (used for heart failure and angina).

If you are using any of these medications you must let your doctor know before you start using any other medications, especially Viagra. To avoid any interactions it is important to let your doctor know about any medications you are using.

Can sildenafil interact with other drugs?

Sildenafil is the active ingredient in Viagra. Sildenafil can interact with other medications, potentially altering effectiveness and causing side effects.

Can Viagra interact with blood pressure medications?

Sildenafil can interact with blood pressure medications, particularly alpha-blockers, which are used to treat hypertension and enlarged prostate. These interactions can lead to side effects such as low blood pressure. Your doctor may suggest a lower starting dose of Sildenafil if you are taking blood pressure medication.

Can Viagra interact with Lisinopril?

This ACE inhibitor used for high blood pressure can be taken with Sildenafil, but monitoring is required. Side effects like dizziness or a rapid heart rate may indicate low blood pressure.

Can Viagra interact with Losartan?

This angiotensin-II receptor antagonist also treats high blood pressure and heart failure. Sildenafil can enhance the blood pressure-lowering effects of Losartan.

Can Viagra interact with Amlodipine?

Yes, Amlodipine is another blood pressure-lowering drug that should be used with caution alongside Sildenafil due to the risk of low blood pressure.

Can Viagra interact with Terazosin?

An alpha-blocker that, when taken with Sildenafil, can cause low blood pressure side effects.

Can Viagra interact with Beta Blockers?

Beta Blockers can actually cause erectile dysfunction. If you're taking them and experiencing ED you should consult with your doctor for possible alternative treatments.

Can Viagra interact with Antidepressants?

Some antidepressants can also cause erectile dysfunction. While antidepressants and sildenafil be taken together, it is recommended that you monitor them for potential side effects.

Can Viagra interact with Adderall?

Adderall is a stimulant for ADHD and can also cause erectile dysfunction. Adderall and Sildenafil can be taken together, but any unwanted symptoms should be discussed with your doctor.

Is it safe to take Viagra with other erectile dysfunction medications?

Taking Viagra with other erectile dysfunction medications is not safe and is strongly discouraged. Combining Viagra with other ED medications like Cialis (Tadalafil) can be dangerous and significantly increases the risk of side effects, including priapism, a prolonged erection that can cause permanent damage to the penile cells. Both medications are PDE5 inhibitors and work in a similar manner, so combining them won't enhance the effectiveness and will actually elevate the risk of side effects.

Is it safe to drink alcohol when taking Viagra?

Drinking alcohol on the day of using Viagra is unlikely to cause any unwanted side effects. You should make sure not to drink too much alcohol when using Viagra as excessive alcohol consumption can make it harder for you to attain an erection despite the presence of Viagra.

Should you avoid recreational drugs when taking Viagra?

Yes, you should avoid recreational drugs when taking Viagra. Recreational drugs come with their own risks, and mixing them with medications like Viagra can be dangerous. Recreational drugs such as cocaine can contribute to erectile dysfunction, making it more challenging to achieve an erection.

One particularly dangerous combination is Viagra with amyl nitrate, commonly found in poppers. This mixture can cause a significant and potentially life-threatening drop in blood pressure. Cannabis should also be avoided when using Viagra as cannabis is linked with reduced sexual performance.

If you have concerns about using recreational drugs alongside Viagra then you should consult with your healthcare provider for further advice.

How can I avoid Sildenafil drug interactions?

Whilst the list of potential interactions between Viagra and other medications may seem long, there are easy ways to avoid them. It is important to be open and honest with your healthcare provider as they will be able to advise you on whether Viagra is suitable for you. You should inform them about any medications you are taking or conditions you are suffering from ensuring you are honest and open to stay safe.

You should also make sure to read the patient information leaflet that is provided with your medication to fully understand what you are going to be using and how to stay safe when using it.

Key Takeaways

Here are the 5 key takeaways about Viagra and its interactions:

Always consult with your doctor before starting Viagra, especially if you are on other medications or have health conditions.
Viagra can interact with various blood pressure medications, particularly alpha-blockers, ACE inhibitors, and angiotensin-II receptor antagonists, potentially leading to low blood pressure.
Combining Viagra with recreational drugs like cocaine, amyl nitrate (poppers), and cannabis is dangerous.
Certain health conditions, such as severe liver or heart issues, and specific medications, particularly nitrates, make using Viagra unsafe.
Taking Viagra with other erectile dysfunction medications, such as Cialis, is unsafe and increases the risk of serious side effects like priapism.

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