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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Fatigue And Sleepiness After Taking Glucosamine?

I have arthritis in my joints and especially my knees. I had one knee replacement almost 10 years ago and it has not been completely successful. I recently saw a Naturopathic doctor and she prescribed Veg-Source Glucosamine Sulfate. 500 mg taking 2 in the a.m. and 2 in the p.m. I have an allergy to sulfates so I am now wondering about this supplement. I never took Glucosamine before because of shellfish allergy but she assured me that this is a vegetarian product not containing any shellfish. I find that I become very tired and sleepy every afternoon and wonder if this is the cause?
posted on Tue, 23 Aug 2016
Twitter Fri, 28 Jun 2019 Answered on
Twitter Sat, 29 Jun 2019 Last reviewed on
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General & Family Physician,  's  Response
Hello,

Glucosamine has side effects like nausea, heartburn, fatigue, tiredness & skin irritation. If you are diabetic glucosamine may increase your blood sugar levels.

Glucosamine thins the blood so it should be used cautiously. Pharmacists & doctors do not prescribe warfarin with glucosamine.

Glucosamine interacts with alcohol or grape juice. Keep your treating doctor informed about all the medications you are taking.

Hope I have answered your query. Let me know if I can assist you further.

Regards,
Dr. Nupur K, General & Family Physician
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What Causes Fatigue And Sleepiness After Taking Glucosamine?

Hello, Glucosamine has side effects like nausea, heartburn, fatigue, tiredness & skin irritation. If you are diabetic glucosamine may increase your blood sugar levels. Glucosamine thins the blood so it should be used cautiously. Pharmacists & doctors do not prescribe warfarin with glucosamine. Glucosamine interacts with alcohol or grape juice. Keep your treating doctor informed about all the medications you are taking. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Nupur K, General & Family Physician