What happens when you take beetroot with tadalafil?
Beetroot delivers a high dose of inorganic nitrate, which the body reduces to nitrite and then to nitric oxide via bacteria in the mouth and gut. Nitric oxide tells the smooth muscle in your arteries to relax, which widens blood vessels and lowers blood pressure. A 70 mL beetroot juice shot can lower systolic blood pressure by around 4-10 mmHg for 12-24 hours.
Tadalafil (Cialis, Adcirca) is a long-acting PDE5 inhibitor. It blocks the enzyme that breaks down cyclic GMP, the intracellular messenger that nitric oxide uses to relax blood vessels. With tadalafil on board, any nitric oxide your body produces hangs around in effect for much longer than usual. Tadalafil itself has a half-life of about 17.5 hours, which is why it is sometimes called the weekend pill.
When you combine concentrated beetroot products with tadalafil, you are increasing nitric oxide production at the same time you are stretching out its vasodilatory effect. The result can be a deeper or more prolonged blood pressure drop than tadalafil alone would produce.
Why is this important?
The formal contraindication on the tadalafil label is for organic nitrate medications like nitroglycerin and isosorbide. The American Heart Association recommends not using organic nitrates within 48 hours of tadalafil because the half-life is so long that the PDE5 inhibition lingers into the next day. The combination can cause severe, occasionally fatal hypotension.
Dietary nitrate from food is metabolized differently than organic nitrate drugs and is not part of the formal contraindication. That said, the cardiovascular trials of beetroot juice use doses that lower blood pressure to a clinically meaningful degree. If you already take tadalafil daily for benign prostatic hyperplasia or pulmonary arterial hypertension, you are also experiencing some baseline blood pressure lowering, and stacking a daily nitrate-rich supplement on top can produce orthostatic symptoms.
Older adults, people on diuretics, people with autonomic neuropathy, and anyone with already-low resting blood pressure are most likely to notice problems.
What should you do?
Eating beets in normal food portions is not a meaningful concern with tadalafil. Whole roasted beets, a few slices of pickled beet on a salad, or beets in a smoothie deliver modest nitrate doses that the body handles routinely.
Be more cautious with three things. First, concentrated beetroot juice shots typically contain 300-500 mg of nitrate per serving and are designed to produce a measurable cardiovascular effect. Save these for days when you are not taking tadalafil, or stop them 48 hours before a tadalafil dose. Second, nitrate-based pre-workout supplements often combine high-dose beetroot extract with citrulline and other vasodilators; layering them with tadalafil multiplies the effect. Third, if you take daily 2.5 or 5 mg tadalafil and want to add a daily beetroot supplement, start at a low dose, check your blood pressure at home, and bring it up with your prescriber.
If you experience dizziness, lightheadedness on standing, severe headache, or palpitations, hydrate, sit down, and reassess your routine. Chest pain or fainting needs prompt medical evaluation.
Which specific products are affected?
The interaction is relevant to all PDE5 inhibitors with long half-lives, but tadalafil is the most prolonged. Brand-name products include Cialis for erectile dysfunction and benign prostatic hyperplasia and Adcirca for pulmonary arterial hypertension, plus generic tadalafil. On the dietary side, the products that matter most are concentrated beetroot juice shots (Beet It, Love Beets, James White and similar), beetroot crystal or powder supplements marketed for nitric oxide or blood pressure, and pre-workout formulas built around beetroot extract or sodium nitrate. Whole beets in food are not the focus.
The bottom line
Tadalafil is not formally contraindicated with dietary nitrate, but its 17.5-hour half-life means any added vasodilator effect from concentrated beetroot products lingers longer than it would with shorter-acting PDE5 inhibitors. Stick to whole-food beet portions if you take tadalafil, separate beetroot shots or nitrate supplements by at least 48 hours, and talk to your prescriber before adding a daily beetroot regimen, especially if you take tadalafil for pulmonary hypertension or already feel lightheaded on standing.