What happens when you take beetroot with sildenafil?
Beetroot is one of the most concentrated dietary sources of inorganic nitrate. Once you swallow it, bacteria on your tongue and in your gut convert nitrate to nitrite, which your body then turns into nitric oxide, a powerful vasodilator that relaxes blood vessels and lowers blood pressure. A typical 70 mL beetroot shot delivers around 400 mg of nitrate and can drop systolic blood pressure by 4-10 mmHg for up to 24 hours.
Sildenafil (Viagra, Revatio) works on the same downstream pathway. It blocks an enzyme called phosphodiesterase type 5 (PDE5), which normally breaks down cyclic GMP, the messenger that nitric oxide uses to relax vascular smooth muscle. By preventing cGMP breakdown, sildenafil prolongs and amplifies any nitric-oxide-driven vasodilation that is already happening.
Put the two together and you are pushing on the same lever from two directions: beetroot increases nitric oxide production, sildenafil prevents the body from clearing the resulting cGMP signal. In theory, this is additive.
Why is this important?
The formal contraindication on the sildenafil label is for organic nitrate drugs like nitroglycerin and isosorbide, which can cause sudden, severe, and sometimes fatal hypotension when combined with PDE5 inhibitors. Dietary nitrate from food is not chemically identical to organic nitrate drugs and does not behave the same way pharmacokinetically. For that reason, most regulatory bodies and the published literature in journals like Circulation distinguish between the two and do not list everyday nitrate-containing vegetables as a contraindication.
However, concentrated beetroot juice and beetroot-based pre-workout shots are not really food in the traditional sense. They deliver a pharmacological dose of nitrate (often 300-800 mg) that produces a measurable, sustained drop in blood pressure. If you also take sildenafil, especially at higher doses (50-100 mg) or for the first time, the combined effect can produce uncomfortable symptoms: dizziness on standing, throbbing headache, flushing, palpitations, or fainting.
People with baseline low blood pressure, those on other antihypertensives, older adults, and anyone who is dehydrated are at higher risk of feeling these effects.
What should you do?
If you are an occasional sildenafil user and you enjoy roasted beets in a salad or a small glass of beet juice with breakfast, you almost certainly do not need to change anything. Whole-food amounts of beetroot are well below the dose used in cardiovascular trials.
Be more careful in three situations. First, avoid concentrated beetroot shots and high-dose nitrate pre-workout supplements (often labeled as containing 400-800 mg of nitrate) on a day you plan to take sildenafil. Second, do not start a daily beetroot supplement regimen without telling your prescriber, since chronic nitrate intake can shift your blood pressure baseline. Third, if you already take a blood pressure medication along with sildenafil, treat beetroot supplementation as you would a new antihypertensive and introduce it slowly.
If you feel lightheaded, get a pounding headache, or feel faint after combining the two, sit or lie down, hydrate, and let the episode pass. Persistent symptoms or chest pain warrant urgent medical attention.
Which specific products are affected?
This applies to all PDE5 inhibitors in the sildenafil family, including Viagra for erectile dysfunction and Revatio for pulmonary arterial hypertension, plus generic sildenafil at any dose. On the food side, the products most likely to matter are concentrated beetroot juice (Beet It, Love Beets, James White), beetroot powder shots and capsules marketed for blood pressure, athletic performance, or nitric oxide support, and pre-workout supplements that list beetroot extract or sodium nitrate as a primary ingredient. Whole roasted or pickled beets in normal serving sizes deliver far less nitrate and are not a practical concern for most people.
The bottom line
Sildenafil is not formally contraindicated with dietary nitrate, but concentrated beetroot juice and nitrate supplements behave more like a low-dose vasodilator than like food. Combining them with sildenafil can produce additive blood pressure lowering, headache, and dizziness, especially at higher sildenafil doses or in people with other cardiovascular medications. Keep whole-food beets, separate concentrated beetroot products from sildenafil dosing, and tell your prescriber if you use a daily nitrate supplement.