That is how drugs such as Valium, Baclofen, Valproate and Neurontin work â by causing an increase of GABA production in the brain. Unfortunately, these drugs all have a plethora of side effects that they can cause as well as being potentially addictive, making them a poor solution for long-term use.
USPS Customer Service. 1  USPS contact numbers are available here for the customer to call the USPS phone number and speak to the representative. 2  Service number: 1-800-275-8777. 3  Domestic & International USPS Tracking: 1-800-222-1811.
Source Identifier. The next two digits of the USPS tracking number are the source identifier. This two-digit code identifies the shipper. Each shipper has its own source identifier, used in conjunction with a longer mailer ID number, also found on the USPS tracking number label.