cardiovascular
13 interactions related to cardiovascular
aspirin + fish oil
Omega-3 fatty acids in fish oil reduce platelet aggregation and prolong bleeding time slightly, theoretically adding to aspirin's antiplatelet effect. Clinical trials, however, consistently show no clinically significant increase in major bleeding even with high-dose fish oil added to aspirin.
losartan + hawthorn
Hawthorn produces modest blood pressure lowering (roughly 5 to 11 mmHg systolic in clinical trials) through vasodilation and mild ACE-like activity. Combined with losartan, the additive effect could occasionally cause hypotension or dizziness, particularly in people on multiple antihypertensives or those starting hawthorn at high doses.
vitamin b6 + vitamin b12
Vitamin B6 (as pyridoxal 5'-phosphate) and vitamin B12 (as methylcobalamin) act as complementary coenzymes in one-carbon metabolism: B12 helps remethylate homocysteine back to methionine, while B6 routes excess homocysteine down the transsulfuration pathway to cysteine. Together they keep blood homocysteine within a healthier range than either nutrient does alone.
hawthorn + coq10
Hawthorn (Crataegus) flavonoids improve myocardial contractility and coronary blood flow through mild ACE inhibition and vasodilation, while CoQ10 supports cardiac ATP production in the electron transport chain. Together they address both the mechanical and metabolic demands of the failing or stressed heart.
energy drinks + beta-blockers
Energy drinks raise sympathetic tone through caffeine, taurine, and guarana, opposing the heart-rate and blood-pressure lowering effects of beta-blockers like metoprolol, atenolol, propranolol, and bisoprolol. Case reports document refractory arrhythmias and hypertensive episodes in patients on beta-blocker therapy who consumed energy drinks regularly.
energy drinks + adderall
Energy drinks deliver high-dose caffeine (often 80-300 mg per can) plus taurine, guarana, and B vitamins that produce additive sympathomimetic effects on top of the amphetamine salts in Adderall. Both substances raise heart rate, blood pressure, and norepinephrine release, which can precipitate palpitations, hypertension, anxiety, insomnia, and in rare cases tachyarrhythmia or coronary vasospasm.
caffeine + adderall
Caffeine and amphetamine salts are both sympathomimetic stimulants. Combining them raises heart rate and blood pressure, worsens anxiety and insomnia, and increases the risk of palpitations, arrhythmias and panic attacks.
garlic + hawthorn
Aged garlic extract lowers blood pressure through endothelial nitric oxide release, mild ACE inhibition, and antioxidant effects, while hawthorn flavonoids provide vasodilation, mild positive inotropy, and improved coronary flow. Together they act on complementary aspects of vascular tone and cardiac function in mild hypertension.
alcohol + aspirin
Alcohol and aspirin together significantly increase the risk of gastrointestinal bleeding because aspirin irreversibly inhibits platelets for their entire 7-10 day lifespan while alcohol damages the gastric lining and impairs clot formation. The risk is particularly elevated for daily low-dose aspirin users who drink regularly.
caffeine + yohimbine
Caffeine and yohimbine are both potent stimulants. Yohimbine blocks alpha-2 adrenergic receptors, raising norepinephrine, while caffeine blocks adenosine receptors and amplifies sympathetic output. Combined, they can cause large rises in heart rate and blood pressure, severe anxiety, tremor, panic attacks, arrhythmias, and have been linked to hospital visits and rare cardiovascular events.
energy drinks + stimulants
Energy drinks layer high-dose caffeine, taurine, guarana, and ginseng on top of any prescription or recreational stimulant (amphetamine, methylphenidate, modafinil, pseudoephedrine, cocaine), producing additive sympathomimetic effects on heart rate, blood pressure, and CNS arousal. The combined load increases the risk of tachyarrhythmia, hypertensive crisis, severe insomnia, and anxiety.
smoking + oral contraceptives
Smoking while using estrogen-containing oral contraceptives synergistically increases the risk of serious cardiovascular events including myocardial infarction, stroke, and venous thromboembolism. The risk is especially pronounced in women over 35 and increases with the number of cigarettes smoked.
nicotine + adenosine
Nicotine produces sympathomimetic cardiovascular effects (increased heart rate, blood pressure, peripheral vasoconstriction) and disrupts adenosine A2A receptor-mediated reflex cardiac control, which can blunt or interfere with the diagnostic and therapeutic actions of intravenous adenosine used for supraventricular tachycardia or cardiac stress testing.