If you'd like to limit the pharmacies available for search on your partner site, you can create a limited network by whitelisting the pharmacies you'd like your customers to see. Whitelisting will only show the pharmacies which you specify and will hide all others.

To create a whitelist, go to your Partner Portal, then to Advanced Settings.

Click "Whitelist Settings"
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Next, enter the full or partial name of the pharmacies you'd like to allow, clicking "Add" for each one.
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The whitelist will match against partial names so, if you wanted to allow all CVS pharmacies, for instance, you could just add "CVS" to the whitelist and that would match against "CVS", "CVS Pharmacy", "CVS Store #2212", etc.