Is it safe to eat opened liverwurst after the expiration date?
Yes in the US the most common date seen is not the so called expiration date it is a sell by date. There is no expiration date required on US foods, except for infant formula. The USDA has no idea how you plan to store your food. Some food can last for years if stored properly.
So think of it like this, could you think of a reason why a store would sell food that is going to expire the same day they sell it.
For instance milk is typically good for 7 days after the SELL by date if kept cool.
When the expiration date has passed on food or dairy products when it's still on the shelves of a supermarket, it should be considered to be unsafe for eating or drinking. In some cases a food label will say. "best to eat after the food opened 10 days or less " for example, this is an item purchased before its expiration date. Once it's opened the above notice on the label should be followed.
There seems to be two theories here. Some say use by expiration date, which sometimes is a year or so after the purchase date. Others say seven to ten days after opening. These are vastly different periods of time. So which is it? Can an opened juice container be left in the fridge for months and still be safe to consume as long as the date hasn't passed the expiration date?
The expiration date on most drugs tell you when the manufacturer is guaranteeing it will have the maximum potency. Taking a drug after the expiration date is taking a chance that it won't be as effective as a drug taken within the "guaranteed effective." So, in answer to your question, on the diphenhydramine, no one knows if it is safe. All you can say for sure, is the manufacturer will not guarantee the drug is…
Is mucinex DM safe to take after expiration date even though the bottle has never been opened and the celophane seal is still on the bottle?
That depends how long after the expiration, how it has been stored and the condition of the can. Usually, canned food has a "best by", not an "expiration". If the "expiration" is recent and the can has been stored properly and is in good condition, the contents could be safe. Whether or not to use it would be your decision.