Hmm... maybe you should have bought the one with 250 mg of calcium
For males 19-50 years of age, calcium intake levels have been established by the U.S. Food and Nutrition Board (the committee which sets the Dietary Reference Intakes) to be,
- Adequate Intake (AI) = 1000 mg/d
- Tolerable Upper Intake Level (UL) = 2500 mg/d
The calcium supplement you have is probably intended for those who get almost no calcium from their diet. Adding up your supplement + multi-vitamin + food sources, I would guess your total intake is not greater than the UL... maybe around 2000 mg (depends on how much is absorbed by your small intestine or whether you have thyroid problems).
There are three hormones which tightly regulate your blood calcium levels -- 1) Calcitonin from your thyroid gland, 2) Vitamin D from your diet/skin, and 3) Parathyroid hormone (PTH) from your parathyroid gland.
When calcium concentrations are too low, PTH
a) triggers the breakdown of bone in order to release calcium;
b) causes the kidneys to reabsorb calcium. This leads to the activation of vitamin D, which raises blood calcium levels mainly through stimulating the small intestine to increase calcium absorption.
When levels are too high, calcitonin
a) causes the kidneys to expel calcium in the urine, rather than reabsorbing it (calcium can also be lost in sweat);
b) inhibits the breakdown of bone and thus, prevents calcium release from the bones.
A calcium overdose (hypercalcaemia) can cause: groans, stones, bones, and psychic moans! Or more specifically, stomach pain, vomiting/nausea, constipation, kidney stones, fragile bones, headaches/confusion, and lethargy. These symptoms usually go away when calcium intake is reduced. More severe effects of high blood calcium can include dehydration, cardiac arrest, and depression.
In a healthy person, calcium homeostasis is usually not a problem. However, rather than risk chronic/acute calcium toxicity, I'd give the doctor a call and/or get the prescription dosage.