27 of my top 30 referrers are pharm sites??

What is going on here and any ideas on how to fix it?

Here are my stats for JOJ this month:
1 14776 5.87% http://www.rxsellermeds.com/
2 14762 5.87% http://www.shiprxmeds.com
3 14757 5.86% http://www.rxmedshere.com
4 14757 5.86% http://www.rxtopmeds.com
5 14756 5.86% http://www.allnetmeds.com
6 14756 5.86% http://www.npdpharmacy.com
7 13440 5.34% - (Direct Request)
8 12306 4.89% http://www.yourhealthypharmacy.com/
9 12253 4.87% http://www.drugs-market.com
10 10201 4.05% http://www.hq-rx.com
11 7395 2.94% http://www.hqmeds.com
12 7365 2.93% http://www.iopharmacy.com
13 4560 1.81% http://www.all-rxmeds.com
14 2506 1.00% http://www.medscost.com
15 2454 0.98% http://www.medscost.com/
16 1412 0.56% http://phentermine1.blog.hr
17 1335 0.53% http://video.search.yahoo.com/video/view
18 1152 0.46% http://phentermine.on2r.de/
19 676 0.27% http://hierist.de/phentermine-/
20 676 0.27% http://phentermine-.boxnet.net
21 676 0.27% http://phentermine-.fluo.net
22 676 0.27% http://www.20six.co.uk/phentermine-
23 601 0.24% http://phentermine.politics.be/
24 564 0.22% http://board.adultinsider.com/showthread.php
25 340 0.14% http://phentermine.netlink.eu.org/
26 339 0.13% http://phentermine.netlink.at/
27 339 0.13% http://phentermine.preissegger.com/
28 298 0.12% http://replica-rolex-w.ho.com.ua
29 296 0.12% http://download-mp3.ho.com.ua
30 262 0.10% http://alprazolam.little.be