S — Supplements

Saccharomyces boulardii and Fluconazole Saccharomyces boulardii and Itraconazole Saccharomyces boulardii and Tacrolimus

saffron (Crocus sativus) and cyclosporine saffron (Crocus sativus) and warfarin

Sage Extract and Donepezil Sage Extract and Memantine

Salicylates (e.g., Willow Bark) and methotrexate

SAM-e and Bupropion SAM-e and Venlafaxine

Schisandra sphenanthera Extract and tacrolimus

Selenium and Armour Thyroid Selenium and Cytomel Selenium and Levothyroxine Selenium and Liothyronine Selenium and NP Thyroid Selenium and Ozempic Selenium and Propylthiouracil (PTU) Selenium and Semaglutide, Liraglutide (Ozempic, Wegovy)

Serrapeptase and Heparin Serrapeptase and Warfarin

Shatavari root extract and Shatavari (Asparagus racemosus)

Siberian Ginseng and digoxin

Silica and Minocycline Silica and Tetracycline

Slow-Release Nicotinic Acid (Niacin) and levothyroxine

Sodium and Hydrochlorothiazide

Sodium (Low-Sodium Diets) and Lithium Orotate

Soy and Levothyroxine

Soy Isoflavones and Levothyroxine Soy Isoflavones and Synthroid

Soybean / Soy Flour and levothyroxine

Soybean flour / Soy and levothyroxine

Spermidine and Sirolimus Spermidine and Warfarin

Spirulina and Activated Charcoal Spirulina and Bentonite Clay Spirulina and Chlorella

SSRIs (e.g., Sertraline, Fluoxetine) and 5-HTP

St Johns Wort and Bupropion St Johns Wort and Duloxetine St Johns Wort and Mirtazapine St Johns Wort and Venlafaxine

St. John's Wort and Acenocoumarol St. John's Wort and Acetaminophen St. John's Wort and Alprazolam St. John's Wort and amiodarone St. John's Wort and Amitriptyline St. John's Wort and Amlodipine St. John's Wort and Apixaban St. John's Wort and Aripiprazole St. John's Wort and Atorvastatin St. John's Wort and Buspirone St. John's Wort and Caffeine St. John's Wort and Candesartan St. John's Wort and Carbamazepine St. John's Wort and Celecoxib St. John's Wort and citalopram St. John's Wort and Clarithromycin St. John's Wort and Clozapine St. John's Wort and Codeine St. John's Wort and cyclosporine St. John's Wort and CYP450-metabolized drugs (general) St. John's Wort and Dabigatran St. John's Wort and Diclofenac St. John's Wort and digoxin St. John's Wort and Diltiazem St. John's Wort and Direct-Acting Oral Anticoagulants (DOACs) — excluding Dabigatran St. John's Wort and Duloxetine St. John's Wort and Edoxaban St. John's Wort and Erythromycin St. John's Wort and escitalopram St. John's Wort and Estradiol St. John's Wort and Felodipine St. John's Wort and Fentanyl St. John's Wort and Fluconazole St. John's Wort and Fluoxetine St. John's Wort and Fluvastatin St. John's Wort and Fluvoxamine St. John's Wort and Glibenclamide St. John's Wort and Glipizide St. John's Wort and Glyburide St. John's Wort and Haloperidol St. John's Wort and Ibuprofen St. John's Wort and Imatinib St. John's Wort and indinavir St. John's Wort and Irbesartan St. John's Wort and Itraconazole St. John's Wort and Ketoconazole St. John's Wort and Letrozole St. John's Wort and Losartan St. John's Wort and Lovastatin St. John's Wort and Melatonin St. John's Wort and Methadone St. John's Wort and Midazolam St. John's Wort and mirtazapine St. John's Wort and Naproxen St. John's Wort and Nifedipine St. John's Wort and Olanzapine St. John's Wort and oral contraceptives St. John's Wort and Oxycodone St. John's Wort and paroxetine St. John's Wort and Phenytoin St. John's Wort and Propranolol St. John's Wort and Quetiapine St. John's Wort and Ramelteon St. John's Wort and Ritonavir St. John's Wort and Rivaroxaban St. John's Wort and Rosuvastatin St. John's Wort and SAM-e St. John's Wort and Saquinavir St. John's Wort and Serotonergic Antidepressants (SSRIs, SNRIs) St. John's Wort and Sertraline St. John's Wort and Sildenafil St. John's Wort and Simvastatin St. John's Wort and Tacrine St. John's Wort and Tacrolimus St. John's Wort and Tadalafil St. John's Wort and Tamoxifen St. John's Wort and Theophylline St. John's Wort and Tizanidine St. John's Wort and Tolbutamide St. John's Wort and Torsemide St. John's Wort and trazodone St. John's Wort and Triazolam St. John's Wort and Tricyclic Antidepressants (Amitriptyline, Nortriptyline, Doxepin, Imipramine, Desipramine, Amoxapine) St. John's Wort and Valproate St. John's Wort and Valsartan St. John's Wort and Vardenafil St. John's Wort and venlafaxine St. John's Wort and Verapamil St. John's Wort and vilazodone St. John's Wort and warfarin St. John's Wort and warfarin sodium St. John's Wort and zolpidem

St. John's Wort (Hypericum perforatum) and sirolimus St. John's Wort (Hypericum perforatum) and tacrolimus

Stimulant ADHD medications (e.g., Amphetamine, Methylphenidate) and L-Theanine Stimulant ADHD medications (e.g., Amphetamine, Methylphenidate) and L-Tyrosine

Sulfite Oxidase Pathway Substrates (High Sulfur Amino Acid Supplements: Methionine, Cysteine, Taurine) and Molybdenum

Swarna Bhasma (Gold ash) and Ayurvedic herbs (heavy metal-containing formulations)