UPDATE 2-Merck begins overseas recall of HDL cholesterol drug

* Merck says recalling drug from wholesalers

* Says retail supplies likely available until mid-March

* Says will discourage doctors from prescribing drug

Jan 11 (Reuters) - Merck & Co said it is recalling Tredaptive, its medicine to raise "good" HDL cholesterol levels, in overseas markets where it is sold, after it failed to prevent heart problems in a large study and raised safety concerns.

The medicine is not approved in the United States but the U.S. drugmaker sells it in about 40 countries.

Merck said it would recall stocks of Tredaptive now held by wholesalers, but that pharmacies can continue to dispense their remaining supplies. Even so, the company said it plans to discourage doctors from prescribing the pill based on negative findings from the trial which were announced last month. The study followed more than 25,000 patients in Europe and China for almost four years.

The company said it will encourage doctors to consider alternative treatments to control cholesterol, but advised patients not to discontinue Tredaptive without first speaking with their physicians.

Merck spokeswoman Pam Eisele said the company expects available retail supplies of Tredaptive to be exhausted by mid-March.

Tredaptive combines an extended-release form of niacin with another drug meant to reduce facial flushing, a side effect of niacin. The medicine has annual sales of less than $20 million. That makes it a tiny product for Merck, which has global annual revenue of about $50 billion.

Merck in December said Tredaptive did no better in the study at preventing heart attacks, deaths or strokes than traditional statin drugs that lower "bad" LDL cholesterol.

Moreover, Merck said the medicine significantly raised the incidence of some types of nonfatal but serious side effects in the study. They included blood, lymph and gastrointestinal problems, as well as respiratory and skin issues.

Tredaptive was approved in the European Union in 2008, but the U.S. Food and Drug Administration was unwilling to approve the pill until Merck conducted the costly long-term study to better assess its safety and effectiveness.

Some analysts had expected Tredaptive to capture annual global sales of more than $1 billion, if it were to win approval in the United States.

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