Government doesn't block Pharmacies (at least in the USA). They might eventually take down some sites, but unless you are behind a filter at a School or Work computer, it's more than likely that your 'block' is related to the IP/Proxy you are using.
Online pharmacies may occasionally block IPs that they believe to make fraudulent orders, since they have to deal with legal issues in a different manner, they only have so many options.
Napsgear for example uses multiple servers, hosts offshore, has DDOS protection and utilizes 'extension websites' like ''1napsgear.org'' and 2napsgear.net'', which automatically go up to replace the first site when it is down for some reason.