Synthroid (Levothyroxine) and Pregabalin Interaction: Safety, Timing, and Monitoring
Board-reviewed guide on taking Synthroid (levothyroxine) with pregabalin. Covers pharmacokinetic data, absorption timing, dose adjustment, and clinical monitoring.
Levothyroxine: Drug Interactions
21 source-based articles maintained by the HealthRX.com Editorial Team.
21articles
4topic areas covered
May 25, 2026latest review
Levothyroxine: Drug Interactions library
Showing 21 of 21 clinical reviews.
Synthroid (Levothyroxine) and Simvastatin Interaction
Clinical guide to taking levothyroxine with simvastatin: mechanism, myopathy risk, timing, monitoring, and dose adjustment recommendations backed by FDA labels and primary literature.
Synthroid (Levothyroxine) and Tadalafil Interaction: What Clinicians and Patients Should Know
Synthroid and tadalafil: medication timing, thyroid-related erectile dysfunction, TSH monitoring and the other prescriptions that matter most.
Synthroid and Acetaminophen Interaction: What You Need to Know
Tylenol and levothyroxine: no clinically significant interaction in most adults. Take your levothyroxine first on an empty stomach, then wait 30 minutes.
Synthroid and Anesthesia: Perioperative Interaction Guide
A guide to levothyroxine (Synthroid) interactions with anesthesia and perioperative care, including when to hold the dose, cardiovascular risks, and what surgeons need to know.
Synthroid and Apixaban Interaction: What Patients and Clinicians Need to Know
A detailed clinical review of the levothyroxine, apixaban drug interaction: mechanism, severity, monitoring parameters, dose considerations, and patient counseling based on FDA labeling and primary literature.
Synthroid and Diphenhydramine Interaction: What You Need to Know
Is it safe to take Synthroid (levothyroxine) with diphenhydramine? A clinical review of the interaction mechanism, severity, monitoring, and timing guidance.
Synthroid and Estradiol HRT Interaction: What You Need to Know
Clinical guide to the levothyroxine (Synthroid) and estradiol HRT drug interaction, including mechanism, dose adjustment, monitoring, and safety considerations.
Synthroid and Finasteride Interaction: Can You Take Levothyroxine with Finasteride Safely?
Evidence-based guide to taking levothyroxine (Synthroid) and finasteride together. Covers pharmacokinetic interactions, thyroid monitoring, dose timing, and clinical recommendations.
Synthroid and Gabapentin Interaction: What You Need to Know
A clinical guide to taking levothyroxine (Synthroid) with gabapentin (Neurontin), covering absorption timing, monitoring, dose adjustments, and safety data.
Synthroid and Hormonal Contraceptives: Drug Interaction, Dose Adjustments, and Monitoring
Board-reviewed guide to the levothyroxine, hormonal contraceptive interaction. Covers mechanism, severity, dose adjustment protocols, TSH monitoring, and clinical evidence.
Synthroid and Imaging Contrast Dye: What You Need to Know Before Your Scan
Does iodinated contrast dye interact with Synthroid (levothyroxine)? Learn the clinical evidence, timing guidelines, and what to tell your radiologist before any imaging study.
Synthroid and Metformin Interaction: What You Need to Know
Can you take Synthroid (levothyroxine) with metformin? Learn about the clinical interaction between these two widely prescribed medications, including effects on TSH levels, monitoring protocols, and dose-adjustment guidance.
Synthroid and NSAIDs (Ibuprofen, Naproxen) Interaction: What You Need to Know
Can you take Synthroid with ibuprofen or naproxen? Learn the clinical mechanisms, risk levels, monitoring parameters, and patient counseling points for the levothyroxine-NSAID interaction.
Synthroid and PPIs (Omeprazole, Pantoprazole) Interaction
Clinical guide to the levothyroxine-PPI interaction: mechanism, severity, dose adjustment strategies, and monitoring protocols for patients on both medications.
Synthroid and Prednisone Interaction: What Patients and Clinicians Need to Know
A guide to the levothyroxine-prednisone drug interaction: mechanism, clinical severity, TSH monitoring schedule, dose adjustment, and patient counseling points.
Synthroid and Progesterone HRT Interaction: What You Need to Know
A guide to the levothyroxine and progesterone HRT interaction: mechanism, clinical impact, monitoring, and dose-adjustment recommendations with primary literature citations.
Synthroid and SSRIs (Sertraline, Escitalopram): What the Interaction Actually Means
A cautious, evidence-graded guide to the levothyroxine and SSRI interaction: mechanism, what monitoring is reasonable, and where the published evidence is thinner than it looks.
Synthroid and Testosterone Interaction: What to Know Before Combining These Medications
A clinical guide to the levothyroxine-testosterone interaction covering mechanism, severity, monitoring labs, dose adjustments, and patient counseling.
Synthroid and Trazodone Interaction: What You Need to Know
Can you take levothyroxine (Synthroid) with trazodone (Desyrel)? What is established about absorption timing and TSH monitoring, what is plausible but unproven about metabolic effects, and what still needs clinician verification.
Synthroid and Warfarin Interaction: Risks, Monitoring, and Dose Adjustments
Levothyroxine (Synthroid) increases warfarin sensitivity by accelerating clotting-factor catabolism. Learn the mechanism, INR monitoring schedule, and dose-adjustment protocol backed by primary literature.