http://community.myfitnesspal.com/en/discussion/10387874/cholesterol-medication/p1

That thread will probably be of use to you.

That said, here's my opinion -- don't do anything until you get the numbers they're going off of.

Here's the thing with LCHF -- there is a chance it can make your numbers look bad on the typical test. This is due to the way it changes your lipids. The changes are actually good, it's just that the test is flawed when LCHF is part of the equation.

Get all of your numbers.

If the doctor is just going off of total cholesterol, drop them like a sack of bricks and get a new one. Total cholesterol, by itself, means precisely squat.

If the doctor is going off of your LDL, request the VAT, particle size, and c-reactive protein tests, especially if your triglycerides are low. Don't take no for an answer, here, because this is what determines whether you're actually at any risk. Only when these tests come back should you discuss medication. If the doctor refuses, get a new doctor.

This is because LDL is almost never measured directly, and the number is a concentration number. When triglycerides are very low or very high, the formula for determining the LDL number breaks down and giving a bad LDL number. Additionally, LCHF increases the density of the LDL particles, which makes them behave more like HDL particles. This is a very good thing. However, increased density even if the number of particles remains the same or decreases, can still increase the concentration number. Ergo, improvements in lipids that look bad on paper.

Also, if you're actively losing weight, your numbers will be skewed, as well. If you've been low carb for a relatively short time, your numbers may actually be better now than they were when you started. Unless your actual, measured LDL is higher than what can be accounted for by weight loss and the LCHF changes, advocate for waiting and monitoring. Odds are good that your numbers will improve on their own, especially when you stop actively losing weight and your weight stays steady for a time.

If your LDL is crazy high, you might be one of small percentage of people who hyper-react to dietary cholesterol and saturated fat. It still might be worth advocating for "watch and wait," and shift your diet around to favor more monounsaturated fats (basically, LCHF, Mediterranean style, with a fair bit of fish and olive oil).

Despite the enormous volume at which cholesterol reducing medications are prescribed, most studies indicate they do not have any positive impact on cardiovascular health...there has been no reduction in strokes or heart attacks for patients on these medications.

Last year this happened to me after being LCHF for 9 months and I said no way because I have just lost a lot of weight and my HDL and triglyceride had flipped to a great ratio but in time my total cholestrol started to drop down again.