There are Demerol Tablets IMAGO, they are very uncommon usually, but here is some info I have rooting around:

DEMEROL Prescribing Information
(meperidine hydrochloride, USP)

DESCRIPTION

Meperidine hydrochloride, a white crystalline substance with a melting point of 186° C to 189° C. It is readily soluble in water and has a neutral reaction and a slightly bitter taste. The solution is not decomposed by a short period of boiling.

The syrup is a pleasant-tasting, nonalcoholic, banana-flavored solution containing 50 mg of DEMEROL, brand of meperidine hydrochloride, per 5 mL teaspoon (25 drops contain 13 mg of DEMEROL). The tablets contain 50 mg or 100 mg of the analgesic.

Inactive Ingredients — TABLETS: Calcium Sulfate, Dibasic Calcium Phosphate, Starch, Stearic Acid, Talc. SYRUP: Benzoic Acid, Flavor, Liquid Glucose, Purified Water, Saccharin Sodium.

Chemically, DEMEROL is 1-Methyl-4-phenyl-4-piperidinecarboxylic acid ethyl ester hydrochloride and has the following structure:

HOW SUPPLIED

For Oral Use
Tablets are white, round and convex: the 50 mg tablet is scored.

Tablets of 50 mg, bottles of 100 (NDC 0024-0335-04), bottles of 500 (NDC 0024-0335-06), Hospital Blister Pak of 25 (NDC 0024-0335-02), 100 mg, bottles of 100 (NDC 0024-0337-04).

SYRUP, nonalcoholic, banana-flavored 50 mg per 5 mL teaspoon, bottles of 16 fl oz (NDC 0024-0332-06).