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.
That depends. In the United States, each state sets the parameters for prescriptions. This means that states decide how long a prescription can be refilled. For example, in Ohio a non-controlled prescription must be initially filled within 6 months or it expires.If it is filled the first time within the six months, it is then good for one year from the date written. Example: You get a prescription for fexofenadine (Allegra, generic) written on 11-13-2006.n the United States, each state sets the parameters for prescriptions. This means that states decide how long a prescription can be refilled. For example, in Ohio a non-controlled prescription must be initially filled within 6 months or it expires.