Limestone is by definition a rock that contains at least 50% calcium carbonate in the form of calcite by weight. All limestones contain at least a few percent other materials. These can be small particles of quartz, feldspar, clay minerals, pyrite, siderite and other minerals.
Answers (4) You have not mentioned the name of the medicine in your post. Ideally 4 times a day means every 6 hours. It depends on what the medicine is as to how rigid you should be in regards to dosing. If the medicine is an antibiotic then every 6 hour dosing is important as is pain relief medication if in severe pain. If the dosing isn't so critical then 4 times a day could be evenly spaced out during the waking hours.
Statins come in tablet or capsule form. They are taken once or twice a day, depending on the particular product. Short-acting statins must be taken in the evening (near bedtime), while long-acting statins can be taken at any time of the day. Either way, make sure to take your dose at the same time each day. Some statins can be taken with or without food; others must be taken with food.