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Alkem Lab - Tablet - 15 S
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Calcitriol (0.25mcg) + Calcium Carbonate (500mg) + Vitamin K2-7 (100mcg)
Delivered across India in about 3–5 days, Chennai next day. ₹49 delivery, free above ₹999.
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Gemcal DS Tablet is used for treatment and prevention of Osteoporosis Treatment of Calcium deficiency.
Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated September 2026
Gemcal DS Tablet contains Calcitriol (0.25mcg) + Calcium Carbonate (500mg) + Vitamin K2-7 (100mcg). It belongs to the Prescription-only medicine, Vitamin D / calcium supplement and Vitamin and mineral supplement class of medicines.
Treatment and prevention of Osteoporosis Treatment of Calcium deficiency
Gemcal-DS Tablet is a combination of Calcitriol, Calcium Carbonate, and Vitamin K2-7. Calcitriol is the active form of Vitamin D. It raises Vitamin D levels in your blood. This in turn raises calcium levels in your blood by helping you absorb more calcium from your intestine. Calcium carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough. Vitamin K2-7 plays a central role in the metabolism of calcium, the main mineral found in your bones and teeth. Vitamin K2-7 activates the calcium-binding actions of two proteins : matrix GLA protein and osteocalcin, which help to build and maintain bone health.
Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Gemcal-DS Tablet may be taken with or without food.
Take it exactly as your doctor prescribed. Do not change the dose or stop early on your own.
If you miss a dose of Gemcal-DS Tablet, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose.
An overdose of this medicine may be harmful — seek medical advice immediately. It can raise blood calcium dangerously, causing thirst, frequent urination, vomiting, confusion and kidney damage. It can cause vomiting and stomach pain, and with iron can be dangerous, especially in children. Do not wait for symptoms to appear — go to the nearest emergency department and take the pack or strip with you.
Most side effects of Gemcal DS are mild and settle as the body adjusts. Reported side effects include:
Stop the medicine and seek help immediately for a rash, swelling of the face or lips, wheezing or difficulty breathing. Tell your doctor about any side effect that persists or worries you.
| Pregnancy | Pregnancy CONSULT YOUR DOCTOR |
|---|---|
| Breastfeeding | Breast feeding CONSULT YOUR DOCTOR |
| Alcohol | Alcohol CONSULT YOUR DOCTOR |
| Driving | Driving CONSULT YOUR DOCTOR |
| Kidney | Kidney CAUTION |
| Liver | Liver CONSULT YOUR DOCTOR |
| Habit forming | No |
This is a prescription-only medicine. Take it exactly as your doctor has directed, for the period directed. Do not share it with anyone else, even if their symptoms seem the same. Tell your doctor about every other medicine, supplement and herbal product you take. Report any unexpected or severe symptom to your doctor rather than stopping on your own. Do not take more than your doctor has advised. Vitamin D builds up in the body and too much raises blood calcium, causing thirst, frequent urination, nausea and confusion. High-dose weekly or monthly sachets are prescription strengths — do not repeat one because you missed a week. Tell your doctor if you have had kidney stones or have kidney disease. A supplement is not a substitute for a balanced diet or for treating the cause of a symptom. Iron makes stools black and can cause constipation — this is expected, but tell your doctor if it troubles you. Keep iron-containing products well out of reach of children; an overdose in a small child is a medical emergency. Check the labels of everything you take so you do not double up on the same nutrient.
Not for anyone with a known allergy to this medicine or to any ingredient in the pack. Your doctor will confirm this medicine is suitable for you. Not for people with a high blood calcium level, or with certain kidney stones.
Give your doctor and pharmacist a full list of everything you take. Calcium reduces the absorption of thyroid tablets, several antibiotics and iron — separate them by a few hours. Water tablets of the thiazide group raise calcium further when combined. Iron, calcium, zinc and magnesium reduce the absorption of thyroid tablets and several antibiotics — separate them by a few hours. Tea and coffee taken with iron reduce how much is absorbed; vitamin C increases it.
Store below 30°C in the original pack, away from direct sunlight and moisture. Keep out of the reach of children.
Gemcal-DS Tablet is used in the treatment of calcium deficiency. Inform your doctor if you have kidney problems, or if you have ever had kidney stones. Let your doctor know if you are taking any other medications like for bone disorders, antihypertensives, antibiotics, antacids, other calcium supplements, or medicines for heart disease. Inform your doctor if you are taking an iron supplement, as the absorption rate might be affected. Include calcium-rich food in your diet like milk, cheese, yogurt, calcium-fortified soya milk, and green leafy vegetables like spinach.

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Compiled from the manufacturer's prescribing information and the sources below, and reviewed by a registered medical practitioner. It does not replace your own doctor's advice.