Define drug-nutrient interaction and drug- drug interactions?

Generally, administering oral medication along with the food or at a mealtime is a convenient manner of drug dosing. However, drug interactions can occur that modify the activity of the drug (decrease or increase drug effects) are referred to as drug- drug interactions or impair the nutritional benefit of certain food are called as a drug-nutrient interaction. While the effect of food or a nutrient on a drug or medication is a nutrient-drug interaction. The most commonly observed type of drug-food interaction affects the drug absorption. Such interactions raise concerns that medications may lead to nutritional deficiencies or a poor diet may change how a medication works. This does not mean that if one is taking a medication, one needs to use a vitamin and or mineral supplement. There is a little chance that taking a medication for a short time (such as a ten day treatment), will affect the nutritional status, However, use of some medications for months or years may affect the nutritional health.