Conversation: The conversation between human and AI assistant.
[|Human|] My Vitamin D3 is onlk 5 much below the desired .Doctor has advised Macalvit 500 for a few days .I am taking at night after dinner . but morning I have strange heavyness in the head and constipation also .Pl ADSVISE . i AM 69 AND bp PATIENT WITH CONTROLLED bp AND sUGAR .
[|AI|]  Vitamin D3 can cause both constipation and headache as side effects. These symptoms usually abate over time. My usual approach for patients with the above complaints would be simple as explained below. For constipation, I would suggest measures like increasing fibrous food in diet. And I would watch over for headache (or in your case heaviness) for a week or so to see whether it improves. Hope this helps you. Thanks.