Film Coating vs Sugar Coating: What to Specify in a Tablet RFQ

Film coating is a thin polymer layer applied in a single stage that adds about 2% to 3% to a tablet's weight (Salawi, Polymers 2022). Sugar coating is a multi-step build-up that adds roughly 30% to 100% (Salawi; Zaid, 2020). Film coating is the modern default.

Sugar coating works in stages: sealing, sub-coating, smoothing, coloring, polishing and printing (Zaid). That sequence makes it time-consuming and raises the final cost of the tablet (Zaid).

Film coating is also where function lives. The polymer layer can improve physical and chemical stability and change how the drug is released (Zaid). A delayed-release version of the idea is covered in our guide to enteric coated tablets.

Sugar coating is rare. Among listings whose dosage form is exactly "tablet, film coated" or "tablet, sugar coated", 62 of 12,253 (about 0.5%) are sugar coated. A further 1,240 listings are film coated, extended release.

How we counted: on October 28, 2026 we queried the FDA NDC directory through openFDA (data last updated October 27, 2026) for each exact dosage-form value and read the total. The 197 to 1 ratio is 12,191 divided by 62. We then pulled all 62 sugar-coated records and tallied them by generic name.

The 62 sugar-coated listings are concentrated:

• chlorpromazine hydrochloride: 24
• conjugated estrogens with medroxyprogesterone acetate: 8
• sirolimus: 6
• desipramine hydrochloride: 6
• sennosides: 6
• tiopronin: 4
• ibuprofen with pseudoephedrine: 3
• bisacodyl and other laxatives: 4
• exemestane: 1

Four limits apply. The directory counts product listings, not drugs or tablets sold. Listings include repackagers' package entries, so the 24 chlorpromazine listings are not 24 distinct products. Labelers choose their own dosage-form term, which is why 1,527 listings say only "coated". And openFDA describes its data as unvalidated. Our reading is that sugar coating is a legacy finish on older products, not a live competitor to film coating for new development.

A film coat adds about 2% to 3% of the core weight, while published sugar-coating figures run from 30% to 100%, so a sugar-coated tablet can weigh far more than its core.

The reviews give adjacent ranges, so treat 30% to 100% as the planning range and let the product decide where it falls.

Worked example (our arithmetic on those percentages) for a 500 mg core:

• Film coating at 2% to 3% adds 10 to 15 mg, giving a tablet of 510 to 515 mg.
• Sugar coating at 30% to 100% adds 150 to 500 mg, giving 650 to 1,000 mg.

Time moves the same way. Dissolving polymers in volatile solvents can cut coating duration "from days to a few hours" (Salawi). Weight gain is not the same as added diameter, so we recommend asking for finished-tablet dimensions in the quote, not inferring them from the percentage.

Coating changes how easily a tablet is swallowed, and the FDA tells generic developers to weigh it when setting a product's quality target. The FDA's June 2015 guidance, Size, Shape, and Other Physical Attributes of Generic Tablets and Capsules, is non-binding and applies to ANDAs submitted to its Office of Generic Drugs.

The guidance states:

• "The presence and composition of a coating can also potentially affect the ease of swallowing tablets or capsules."
• The lack of a film coating can decrease tablet mobility compared with a coated tablet of the same size and shape.
• Coating also affects palatability and smell.
• Swallowing complaints increase at tablet sizes above approximately 8 mm in diameter.
• More than 16 million people in the US have some difficulty swallowing, and a survey it cites suggests as many as 40 percent of Americans may have trouble with tablets and capsules.
• A generic tablet intended to be swallowed whole should be of similar size to its reference listed drug (RLD), the product the generic is measured against.
• Coating and weight belong in the quality target product profile (QTPP), the summary of the characteristics a product must meet.

Our inference: because sugar coating adds 30% or more to weight, it works against matching a reference tablet's size, and film coating gives the most room to stay close to it. Film coating is not free of faults, though; those are in the RFQ section below.

Yes in the records checked, so confirm sucrose in the inactive-ingredient list. In October 2026 we read the first three openFDA label records returned for each generic name and searched the inactive-ingredient text for sucrose. It appeared in two of three sirolimus records, in the Norpramin record of three desipramine records, and in one sennosides tablet record. These drugs all appear among the sugar-coated listings.

If a product must be sucrose-free, check the inactive-ingredient list in its label.

Colorants need the same check. Titanium dioxide, a white pigment, is permitted "for coloring ingested and externally applied drugs generally, in amounts consistent with good manufacturing practice," and is exempt from batch certification under 21 CFR 73.1575. Whether your customers or other markets accept a given pigment is a separate question, so list it in the specification.

Start with film coating and move to sugar coating only when an existing product's finish is the reason. Our recommendation rests on the evidence above, and each row below is a test you can answer yes or no.

For a bitter active, whichever coating is chosen, ask the manufacturer to show taste-masking results on the proposed coat.

A tablet RFQ should name the coating type, the target weight gain, the finished dimensions, the colorants, sucrose status and dissolution limits, so no quote can be built on "coated" alone. Copy these lines, each with a pass and a fail:

We are a technology-driven contract development and manufacturing organization (CDMO) for oral dosage forms, providing product development through commercial manufacturing. Our buying route runs from inquiry to feasibility review, commercial quotation, development or technical transfer, production and quality control, packaging and dispatch. Put the lines above into your inquiry. Our oral solid dosage manufacturing guide (oral solid dosage manufacturing) and our third-party manufacturing guide (third-party manufacturing) cover the later steps.

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