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.
A prescription for a controlled drug is valid for 28 days from the date on the prescription. If you have a prescription for a controlled drug that states the drug should be dispensed in several instalments, the first instalment must be dispensed within 28 days of the date on the prescription. repeat prescription must be dispensed for the first time within six months of the date on the prescription. After this, the repeat prescription can continue to be valid beyond six months, according to the directions on the prescription.