Review:

Lighter and arguably more satisfying than the various citrus-heavy Doctor Cocktail recipes (see Doctor No. 1 to No. 4). Obviously, with two such dominant ingredients, your choice of rum and Swedish punch will greatly influence the result.

Variant:

In his 1948 The Fine Art of Mixing Drinks, David A. Embury says, "There are numerous recipes for this drink. Here are several. Shake well with cracked ice.
Doctor No. 1 Equal parts of lime juice and Swedish Punch.
Doctor No. 2 Equal parts of lemon juice, Swedish Punch, and gin. This is also known as the Greta Garbo.
Doctor No. 3 One part lemon juice, 1 part orange juice, 2 parts Swedish Punch.
Doctor No. 4 One part lime juice, 2 parts Jamaican rum, 3 parts Swedish Punch."

History:

There are earlier Doctor recipes combining Swedish punch and rum (see Doctor No. 1), but this recipe, which first appeared in Frank Meier's 1936 Artistry of Mixing Drinks, has proved the most enduring, helped by its being republished in Victor Bergeron's 1947 Bartender's Guide... by Trader Vic

DOCTOR
In shaker: a teaspoon each of Lemon and Orange juice, half Swedish Punch, half Bacardi; shake well and serve.

Frank Meier, Artistry of Mixing Drinks, 1936

DOCTOR COCKTAIL
1½ oz. Swedish Punch
¾ oz. Jamaica rum
1 tsp. lemon juice
1 tsp. orange juice
Shake well with cracked ice; strain into chilled cocktail glass.
Variations: Substitute the juice of ½ lime for lemon and orange juice. Equal parts rum and Swedish punch may be used.

Victor Bergeron, Bartender's Guide By Trader Vic, 1947

Nutrition:

One serving of Doctor contains 191 calories