1. (General Engineering) tungsten-electrode inert gas welding: a method of welding in which the arc is maintained by a tungsten electrode and shielded from the access of air by an inert gas. Compare MIG welding.
A prescription for a controlled drug is valid for 28 days from the date given on the prescription. usually six months unless it's a controlled i.e. morphine, pethidine and methadone. These medicines are often misused, so have stricter legal controls on their supply to prevent them being obtained illegally. A prescription for a controlled drug is valid for 28 days from the date given on the prescription.
Prescription medications all come stamped with an expiration date from the manufacturer when we receive the medications in the pharmacy. But they really only apply when the medication is stored under perfect conditions. In general, prescription medications, once taken out of the pharmacy and stored in someoneâs home, are good for one year from the date they were filled. If you want more specific information, you need to talk to the pharmacist who filled your prescription since this is only a guideline.